Finding the Fourth Proportional to 12,438.72, 17,157.72 and 7,399.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,438.72 : 17,157.72 = 7,399.53 : x
2. Step 2: Convert to fraction form
   12,438.72/17,157.72 = 7,399.53/x
3. Step 3: Cross multiply
   12,438.72x = 17,157.72 × 7,399.53
4. Step 4: Simplify right side
   12,438.72x = 126,959,063.87
5. Step 5: Solve for x
   x = 126,959,063.87/12,438.72
6. Step 6: Final answer
   x = 10,206.76