Finding the Fourth Proportional to 13,240.67, 18,271.10 and 7,272.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,240.67 : 18,271.10 = 7,272.72 : x
2. Step 2: Convert to fraction form
   13,240.67/18,271.10 = 7,272.72/x
3. Step 3: Cross multiply
   13,240.67x = 18,271.10 × 7,272.72
4. Step 4: Simplify right side
   13,240.67x = 132,880,612.57
5. Step 5: Solve for x
   x = 132,880,612.57/13,240.67
6. Step 6: Final answer
   x = 10,035.80