Finding the Fourth Proportional to 139,129.58, 191,998.85 and 78,698.94

Step by Step Solution

1. Step 1: Write the proportion equation
   139,129.58 : 191,998.85 = 78,698.94 : x
2. Step 2: Convert to fraction form
   139,129.58/191,998.85 = 78,698.94/x
3. Step 3: Cross multiply
   139,129.58x = 191,998.85 × 78,698.94
4. Step 4: Simplify right side
   139,129.58x = 15,110,105,976.22
5. Step 5: Solve for x
   x = 15,110,105,976.22/139,129.58
6. Step 6: Final answer
   x = 108,604.55