Finding the Fourth Proportional to 13,088.18, 18,061.42 and 7,120

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.18 : 18,061.42 = 7,120 : x
2. Step 2: Convert to fraction form
   13,088.18/18,061.42 = 7,120/x
3. Step 3: Cross multiply
   13,088.18x = 18,061.42 × 7,120
4. Step 4: Simplify right side
   13,088.18x = 128,597,310.40
5. Step 5: Solve for x
   x = 128,597,310.40/13,088.18
6. Step 6: Final answer
   x = 9,825.45