Finding the Fourth Proportional to 139,046.59, 191,894.12 and 78,617.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139,046.59 : 191,894.12 = 78,617.82 : x
2. Step 2: Convert to fraction form
   139,046.59/191,894.12 = 78,617.82/x
3. Step 3: Cross multiply
   139,046.59x = 191,894.12 × 78,617.82
4. Step 4: Simplify right side
   139,046.59x = 15,086,297,385.22
5. Step 5: Solve for x
   x = 15,086,297,385.22/139,046.59
6. Step 6: Final answer
   x = 108,498.15