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Finding the Fourth Proportional to 21,258.93, 31,860.63 and 8,764.68

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Solution

The fourth proportional to 21,258.93, 31,860.63 and 8,764.68 is: 13,135.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,258.93 : 31,860.63 = 8,764.68 : x
  2. Step 2: Convert to fraction form
    21,258.93/31,860.63 = 8,764.68/x
  3. Step 3: Cross multiply
    21,258.93x = 31,860.63 × 8,764.68
  4. Step 4: Simplify right side
    21,258.93x = 279,248,226.55
  5. Step 5: Solve for x
    x = 279,248,226.55/21,258.93
  6. Step 6: Final answer
    x = 13,135.57

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