Finding the Fourth Proportional to 13,088.59, 18,061.72 and 7,120.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.59 : 18,061.72 = 7,120.13 : x
2. Step 2: Convert to fraction form
   13,088.59/18,061.72 = 7,120.13/x
3. Step 3: Cross multiply
   13,088.59x = 18,061.72 × 7,120.13
4. Step 4: Simplify right side
   13,088.59x = 128,601,704.12
5. Step 5: Solve for x
   x = 128,601,704.12/13,088.59
6. Step 6: Final answer
   x = 9,825.49