Finding the Fourth Proportional to 140,111.79, 193,358.55 and 79,691.15

Step by Step Solution

1. Step 1: Write the proportion equation
   140,111.79 : 193,358.55 = 79,691.15 : x
2. Step 2: Convert to fraction form
   140,111.79/193,358.55 = 79,691.15/x
3. Step 3: Cross multiply
   140,111.79x = 193,358.55 × 79,691.15
4. Step 4: Simplify right side
   140,111.79x = 15,408,964,245.04
5. Step 5: Solve for x
   x = 15,408,964,245.04/140,111.79
6. Step 6: Final answer
   x = 109,976.21