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Finding the Fourth Proportional to 81,321.70, 121,982.55 and 66,547.30

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Solution

The fourth proportional to 81,321.70, 121,982.55 and 66,547.30 is: 99,820.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,321.70 : 121,982.55 = 66,547.30 : x
  2. Step 2: Convert to fraction form
    81,321.70/121,982.55 = 66,547.30/x
  3. Step 3: Cross multiply
    81,321.70x = 121,982.55 × 66,547.30
  4. Step 4: Simplify right side
    81,321.70x = 8,117,609,349.62
  5. Step 5: Solve for x
    x = 8,117,609,349.62/81,321.70
  6. Step 6: Final answer
    x = 99,820.95

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