Finding the Fourth Proportional to 13,088.73, 18,062.74 and 7,120.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,088.73 : 18,062.74 = 7,120.72 : x
2. Step 2: Convert to fraction form
   13,088.73/18,062.74 = 7,120.72/x
3. Step 3: Cross multiply
   13,088.73x = 18,062.74 × 7,120.72
4. Step 4: Simplify right side
   13,088.73x = 128,619,713.97
5. Step 5: Solve for x
   x = 128,619,713.97/13,088.73
6. Step 6: Final answer
   x = 9,826.75