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Finding the Fourth Proportional to 128,268.61, 177,010.91 and 71,679.98

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Solution

The fourth proportional to 128,268.61, 177,010.91 and 71,679.98 is: 98,918.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,268.61 : 177,010.91 = 71,679.98 : x
  2. Step 2: Convert to fraction form
    128,268.61/177,010.91 = 71,679.98/x
  3. Step 3: Cross multiply
    128,268.61x = 177,010.91 × 71,679.98
  4. Step 4: Simplify right side
    128,268.61x = 12,688,138,488.58
  5. Step 5: Solve for x
    x = 12,688,138,488.58/128,268.61
  6. Step 6: Final answer
    x = 98,918.50

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