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Finding the Fourth Proportional to 106,489.20, 159,401.40 and 78,440.88

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Solution

The fourth proportional to 106,489.20, 159,401.40 and 78,440.88 is: 117,416.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    106,489.20 : 159,401.40 = 78,440.88 : x
  2. Step 2: Convert to fraction form
    106,489.20/159,401.40 = 78,440.88/x
  3. Step 3: Cross multiply
    106,489.20x = 159,401.40 × 78,440.88
  4. Step 4: Simplify right side
    106,489.20x = 12,503,586,089.23
  5. Step 5: Solve for x
    x = 12,503,586,089.23/106,489.20
  6. Step 6: Final answer
    x = 117,416.47

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