Finding the Fourth Proportional to 115,725.76, 173,410.04 and 78,138.52

Step by Step Solution

1. Step 1: Write the proportion equation
   115,725.76 : 173,410.04 = 78,138.52 : x
2. Step 2: Convert to fraction form
   115,725.76/173,410.04 = 78,138.52/x
3. Step 3: Cross multiply
   115,725.76x = 173,410.04 × 78,138.52
4. Step 4: Simplify right side
   115,725.76x = 13,550,003,488.05
5. Step 5: Solve for x
   x = 13,550,003,488.05/115,725.76
6. Step 6: Final answer
   x = 117,087.19