Finding the Fourth Proportional to 11,077.57, 16,602.43 and 8,728.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,077.57 : 16,602.43 = 8,728.30 : x
2. Step 2: Convert to fraction form
   11,077.57/16,602.43 = 8,728.30/x
3. Step 3: Cross multiply
   11,077.57x = 16,602.43 × 8,728.30
4. Step 4: Simplify right side
   11,077.57x = 144,910,989.77
5. Step 5: Solve for x
   x = 144,910,989.77/11,077.57
6. Step 6: Final answer
   x = 13,081.48