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Finding the Fourth Proportional to 81,415.20, 122,137.20 and 28,855.20

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Solution

The fourth proportional to 81,415.20, 122,137.20 and 28,855.20 is: 43,287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,415.20 : 122,137.20 = 28,855.20 : x
  2. Step 2: Convert to fraction form
    81,415.20/122,137.20 = 28,855.20/x
  3. Step 3: Cross multiply
    81,415.20x = 122,137.20 × 28,855.20
  4. Step 4: Simplify right side
    81,415.20x = 3,524,293,333.44
  5. Step 5: Solve for x
    x = 3,524,293,333.44/81,415.20
  6. Step 6: Final answer
    x = 43,287.90

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