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Finding the Fourth Proportional to 120,919.20, 181,378.80 and 76,401.60

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Solution

The fourth proportional to 120,919.20, 181,378.80 and 76,401.60 is: 114,602.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,919.20 : 181,378.80 = 76,401.60 : x
  2. Step 2: Convert to fraction form
    120,919.20/181,378.80 = 76,401.60/x
  3. Step 3: Cross multiply
    120,919.20x = 181,378.80 × 76,401.60
  4. Step 4: Simplify right side
    120,919.20x = 13,857,630,526.08
  5. Step 5: Solve for x
    x = 13,857,630,526.08/120,919.20
  6. Step 6: Final answer
    x = 114,602.40

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