Finding the Fourth Proportional to 15,155.91, 20,914.61 and 8,868.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,155.91 : 20,914.61 = 8,868.15 : x
2. Step 2: Convert to fraction form
   15,155.91/20,914.61 = 8,868.15/x
3. Step 3: Cross multiply
   15,155.91x = 20,914.61 × 8,868.15
4. Step 4: Simplify right side
   15,155.91x = 185,473,854.33
5. Step 5: Solve for x
   x = 185,473,854.33/15,155.91
6. Step 6: Final answer
   x = 12,237.72