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Finding the Fourth Proportional to 7,920.40, 10,926.72 and 4,774.80

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Solution

The fourth proportional to 7,920.40, 10,926.72 and 4,774.80 is: 6,587.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.40 : 10,926.72 = 4,774.80 : x
  2. Step 2: Convert to fraction form
    7,920.40/10,926.72 = 4,774.80/x
  3. Step 3: Cross multiply
    7,920.40x = 10,926.72 × 4,774.80
  4. Step 4: Simplify right side
    7,920.40x = 52,172,902.66
  5. Step 5: Solve for x
    x = 52,172,902.66/7,920.40
  6. Step 6: Final answer
    x = 6,587.16

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