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Finding the Fourth Proportional to 86,140.70, 128,919.45 and 75,643.10

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Solution

The fourth proportional to 86,140.70, 128,919.45 and 75,643.10 is: 113,208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,140.70 : 128,919.45 = 75,643.10 : x
  2. Step 2: Convert to fraction form
    86,140.70/128,919.45 = 75,643.10/x
  3. Step 3: Cross multiply
    86,140.70x = 128,919.45 × 75,643.10
  4. Step 4: Simplify right side
    86,140.70x = 9,751,866,848.30
  5. Step 5: Solve for x
    x = 9,751,866,848.30/86,140.70
  6. Step 6: Final answer
    x = 113,208.59

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