Finding the Fourth Proportional to 13,240.72, 18,272.13 and 7,272.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,240.72 : 18,272.13 = 7,272.50 : x
2. Step 2: Convert to fraction form
   13,240.72/18,272.13 = 7,272.50/x
3. Step 3: Cross multiply
   13,240.72x = 18,272.13 × 7,272.50
4. Step 4: Simplify right side
   13,240.72x = 132,884,065.43
5. Step 5: Solve for x
   x = 132,884,065.43/13,240.72
6. Step 6: Final answer
   x = 10,036.02