Finding the Fourth Proportional to 10,978.61, 16,470.61 and 3,187.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.61 : 16,470.61 = 3,187.42 : x
2. Step 2: Convert to fraction form
   10,978.61/16,470.61 = 3,187.42/x
3. Step 3: Cross multiply
   10,978.61x = 16,470.61 × 3,187.42
4. Step 4: Simplify right side
   10,978.61x = 52,498,702.58
5. Step 5: Solve for x
   x = 52,498,702.58/10,978.61
6. Step 6: Final answer
   x = 4,781.91