Finding the Fourth Proportional to 13,088.50, 18,061.61 and 7,120.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.50 : 18,061.61 = 7,120.17 : x
2. Step 2: Convert to fraction form
   13,088.50/18,061.61 = 7,120.17/x
3. Step 3: Cross multiply
   13,088.50x = 18,061.61 × 7,120.17
4. Step 4: Simplify right side
   13,088.50x = 128,601,698.07
5. Step 5: Solve for x
   x = 128,601,698.07/13,088.50
6. Step 6: Final answer
   x = 9,825.55