Finding the Fourth Proportional to 13,088.56, 18,061.95 and 7,120.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.56 : 18,061.95 = 7,120.38 : x
2. Step 2: Convert to fraction form
   13,088.56/18,061.95 = 7,120.38/x
3. Step 3: Cross multiply
   13,088.56x = 18,061.95 × 7,120.38
4. Step 4: Simplify right side
   13,088.56x = 128,607,947.54
5. Step 5: Solve for x
   x = 128,607,947.54/13,088.56
6. Step 6: Final answer
   x = 9,825.98