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Finding the Fourth Proportional to 87,981.74, 121,461.90 and 68,820.80

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Solution

The fourth proportional to 87,981.74, 121,461.90 and 68,820.80 is: 95,009.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,981.74 : 121,461.90 = 68,820.80 : x
  2. Step 2: Convert to fraction form
    87,981.74/121,461.90 = 68,820.80/x
  3. Step 3: Cross multiply
    87,981.74x = 121,461.90 × 68,820.80
  4. Step 4: Simplify right side
    87,981.74x = 8,359,105,184.42
  5. Step 5: Solve for x
    x = 8,359,105,184.42/87,981.74
  6. Step 6: Final answer
    x = 95,009.55

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