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Finding the Fourth Proportional to 3,919.78, 5,403.27 and 2,798.74

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Solution

The fourth proportional to 3,919.78, 5,403.27 and 2,798.74 is: 3,857.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919.78 : 5,403.27 = 2,798.74 : x
  2. Step 2: Convert to fraction form
    3,919.78/5,403.27 = 2,798.74/x
  3. Step 3: Cross multiply
    3,919.78x = 5,403.27 × 2,798.74
  4. Step 4: Simplify right side
    3,919.78x = 15,122,347.88
  5. Step 5: Solve for x
    x = 15,122,347.88/3,919.78
  6. Step 6: Final answer
    x = 3,857.96

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