Finding the Fourth Proportional to 13,139.72, 18,136.50 and 7,552.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.72 : 18,136.50 = 7,552.52 : x
2. Step 2: Convert to fraction form
   13,139.72/18,136.50 = 7,552.52/x
3. Step 3: Cross multiply
   13,139.72x = 18,136.50 × 7,552.52
4. Step 4: Simplify right side
   13,139.72x = 136,976,278.98
5. Step 5: Solve for x
   x = 136,976,278.98/13,139.72
6. Step 6: Final answer
   x = 10,424.60