Finding the Fourth Proportional to 11,056.90, 15,229.47 and 8,499.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,056.90 : 15,229.47 = 8,499.78 : x
2. Step 2: Convert to fraction form
   11,056.90/15,229.47 = 8,499.78/x
3. Step 3: Cross multiply
   11,056.90x = 15,229.47 × 8,499.78
4. Step 4: Simplify right side
   11,056.90x = 129,447,144.52
5. Step 5: Solve for x
   x = 129,447,144.52/11,056.90
6. Step 6: Final answer
   x = 11,707.36