Finding the Fourth Proportional to 12,417.39, 17,139.63 and 7,385.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,417.39 : 17,139.63 = 7,385.15 : x
2. Step 2: Convert to fraction form
   12,417.39/17,139.63 = 7,385.15/x
3. Step 3: Cross multiply
   12,417.39x = 17,139.63 × 7,385.15
4. Step 4: Simplify right side
   12,417.39x = 126,578,738.49
5. Step 5: Solve for x
   x = 126,578,738.49/12,417.39
6. Step 6: Final answer
   x = 10,193.67