Finding the Fourth Proportional to 139,196.18, 192,040.52 and 78,766.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,196.18 : 192,040.52 = 78,766.18 : x
2. Step 2: Convert to fraction form
   139,196.18/192,040.52 = 78,766.18/x
3. Step 3: Cross multiply
   139,196.18x = 192,040.52 × 78,766.18
4. Step 4: Simplify right side
   139,196.18x = 15,126,298,165.61
5. Step 5: Solve for x
   x = 15,126,298,165.61/139,196.18
6. Step 6: Final answer
   x = 108,668.92