Finding the Fourth Proportional to 12,438.84, 17,157.78 and 7,399.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,438.84 : 17,157.78 = 7,399.47 : x
2. Step 2: Convert to fraction form
   12,438.84/17,157.78 = 7,399.47/x
3. Step 3: Cross multiply
   12,438.84x = 17,157.78 × 7,399.47
4. Step 4: Simplify right side
   12,438.84x = 126,958,478.38
5. Step 5: Solve for x
   x = 126,958,478.38/12,438.84
6. Step 6: Final answer
   x = 10,206.62