Finding the Fourth Proportional to 11,718.72, 16,155.02 and 8,355.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,718.72 : 16,155.02 = 8,355.71 : x
2. Step 2: Convert to fraction form
   11,718.72/16,155.02 = 8,355.71/x
3. Step 3: Cross multiply
   11,718.72x = 16,155.02 × 8,355.71
4. Step 4: Simplify right side
   11,718.72x = 134,986,539.61
5. Step 5: Solve for x
   x = 134,986,539.61/11,718.72
6. Step 6: Final answer
   x = 11,518.88