Finding the Fourth Proportional to 13,088.12, 18,061.28 and 7,711.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.12 : 18,061.28 = 7,711.16 : x
2. Step 2: Convert to fraction form
   13,088.12/18,061.28 = 7,711.16/x
3. Step 3: Cross multiply
   13,088.12x = 18,061.28 × 7,711.16
4. Step 4: Simplify right side
   13,088.12x = 139,273,419.88
5. Step 5: Solve for x
   x = 139,273,419.88/13,088.12
6. Step 6: Final answer
   x = 10,641.21