Finding the Fourth Proportional to 13,088.72, 18,062.33 and 7,120.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.72 : 18,062.33 = 7,120.31 : x
2. Step 2: Convert to fraction form
   13,088.72/18,062.33 = 7,120.31/x
3. Step 3: Cross multiply
   13,088.72x = 18,062.33 × 7,120.31
4. Step 4: Simplify right side
   13,088.72x = 128,609,263.01
5. Step 5: Solve for x
   x = 128,609,263.01/13,088.72
6. Step 6: Final answer
   x = 9,825.96