Finding the Fourth Proportional to 12,932.39, 19,397.49 and 5,139.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,932.39 : 19,397.49 = 5,139.11 : x
2. Step 2: Convert to fraction form
   12,932.39/19,397.49 = 5,139.11/x
3. Step 3: Cross multiply
   12,932.39x = 19,397.49 × 5,139.11
4. Step 4: Simplify right side
   12,932.39x = 99,685,834.83
5. Step 5: Solve for x
   x = 99,685,834.83/12,932.39
6. Step 6: Final answer
   x = 7,708.23