Finding the Fourth Proportional to 13,142.56, 18,156.52 and 8,616.00

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.56 : 18,156.52 = 8,616.00 : x
2. Step 2: Convert to fraction form
   13,142.56/18,156.52 = 8,616.00/x
3. Step 3: Cross multiply
   13,142.56x = 18,156.52 × 8,616.00
4. Step 4: Simplify right side
   13,142.56x = 156,436,465.63
5. Step 5: Solve for x
   x = 156,436,465.63/13,142.56
6. Step 6: Final answer
   x = 11,903.04