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Finding the Fourth Proportional to 140,679,978.20, 211,019,967.30 and 128,138,845.40

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Solution

The fourth proportional to 140,679,978.20, 211,019,967.30 and 128,138,845.40 is: 192,208,268.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,679,978.20 : 211,019,967.30 = 128,138,845.40 : x
  2. Step 2: Convert to fraction form
    140,679,978.20/211,019,967.30 = 128,138,845.40/x
  3. Step 3: Cross multiply
    140,679,978.20x = 211,019,967.30 × 128,138,845.40
  4. Step 4: Simplify right side
    140,679,978.20x = 27,039,854,966,167,760
  5. Step 5: Solve for x
    x = 27,039,854,966,167,760/140,679,978.20
  6. Step 6: Final answer
    x = 192,208,268.10

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