Finding the Fourth Proportional to 13,088.78, 18,062.68 and 7,120.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.78 : 18,062.68 = 7,120.61 : x
2. Step 2: Convert to fraction form
   13,088.78/18,062.68 = 7,120.61/x
3. Step 3: Cross multiply
   13,088.78x = 18,062.68 × 7,120.61
4. Step 4: Simplify right side
   13,088.78x = 128,617,191.72
5. Step 5: Solve for x
   x = 128,617,191.72/13,088.78
6. Step 6: Final answer
   x = 9,826.53