Finding the Fourth Proportional to 123,407.10, 185,128.76 and 39,139.17

Step by Step Solution

1. Step 1: Write the proportion equation
   123,407.10 : 185,128.76 = 39,139.17 : x
2. Step 2: Convert to fraction form
   123,407.10/185,128.76 = 39,139.17/x
3. Step 3: Cross multiply
   123,407.10x = 185,128.76 × 39,139.17
4. Step 4: Simplify right side
   123,407.10x = 7,245,785,813.83
5. Step 5: Solve for x
   x = 7,245,785,813.83/123,407.10
6. Step 6: Final answer
   x = 58,714.50