Finding the Fourth Proportional to 10,008.72, 15,013.62 and 2,613.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,008.72 : 15,013.62 = 2,613.20 : x
2. Step 2: Convert to fraction form
   10,008.72/15,013.62 = 2,613.20/x
3. Step 3: Cross multiply
   10,008.72x = 15,013.62 × 2,613.20
4. Step 4: Simplify right side
   10,008.72x = 39,233,516.72
5. Step 5: Solve for x
   x = 39,233,516.72/10,008.72
6. Step 6: Final answer
   x = 3,919.93