Finding the Fourth Proportional to 115,726.51, 173,411.16 and 78,139.27

Step by Step Solution

1. Step 1: Write the proportion equation
   115,726.51 : 173,411.16 = 78,139.27 : x
2. Step 2: Convert to fraction form
   115,726.51/173,411.16 = 78,139.27/x
3. Step 3: Cross multiply
   115,726.51x = 173,411.16 × 78,139.27
4. Step 4: Simplify right side
   115,726.51x = 13,550,221,452.25
5. Step 5: Solve for x
   x = 13,550,221,452.25/115,726.51
6. Step 6: Final answer
   x = 117,088.31