Finding the Fourth Proportional to 10,111.18, 15,157.53 and 8,561.17

Step by Step Solution

1. Step 1: Write the proportion equation
   10,111.18 : 15,157.53 = 8,561.17 : x
2. Step 2: Convert to fraction form
   10,111.18/15,157.53 = 8,561.17/x
3. Step 3: Cross multiply
   10,111.18x = 15,157.53 × 8,561.17
4. Step 4: Simplify right side
   10,111.18x = 129,766,191.11
5. Step 5: Solve for x
   x = 129,766,191.11/10,111.18
6. Step 6: Final answer
   x = 12,833.93