Finding the Fourth Proportional to 140,100.72, 193,339.62 and 76,439.85

Step by Step Solution

1. Step 1: Write the proportion equation
   140,100.72 : 193,339.62 = 76,439.85 : x
2. Step 2: Convert to fraction form
   140,100.72/193,339.62 = 76,439.85/x
3. Step 3: Cross multiply
   140,100.72x = 193,339.62 × 76,439.85
4. Step 4: Simplify right side
   140,100.72x = 14,778,851,551.86
5. Step 5: Solve for x
   x = 14,778,851,551.86/140,100.72
6. Step 6: Final answer
   x = 105,487.33