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Finding the Fourth Proportional to 85,911.36, 128,799 and 39,138.72

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Solution

The fourth proportional to 85,911.36, 128,799 and 39,138.72 is: 58,677.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,911.36 : 128,799 = 39,138.72 : x
  2. Step 2: Convert to fraction form
    85,911.36/128,799 = 39,138.72/x
  3. Step 3: Cross multiply
    85,911.36x = 128,799 × 39,138.72
  4. Step 4: Simplify right side
    85,911.36x = 5,041,027,997.28
  5. Step 5: Solve for x
    x = 5,041,027,997.28/85,911.36
  6. Step 6: Final answer
    x = 58,677.08

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