Finding the Fourth Proportional to 10,978.72, 16,470.80 and 3,187.44

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.72 : 16,470.80 = 3,187.44 : x
2. Step 2: Convert to fraction form
   10,978.72/16,470.80 = 3,187.44/x
3. Step 3: Cross multiply
   10,978.72x = 16,470.80 × 3,187.44
4. Step 4: Simplify right side
   10,978.72x = 52,499,686.75
5. Step 5: Solve for x
   x = 52,499,686.75/10,978.72
6. Step 6: Final answer
   x = 4,781.95