Finding the Fourth Proportional to 139,129.22, 191,998.32 and 78,698.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,129.22 : 191,998.32 = 78,698.56 : x
2. Step 2: Convert to fraction form
   139,129.22/191,998.32 = 78,698.56/x
3. Step 3: Cross multiply
   139,129.22x = 191,998.32 × 78,698.56
4. Step 4: Simplify right side
   139,129.22x = 15,109,991,306.42
5. Step 5: Solve for x
   x = 15,109,991,306.42/139,129.22
6. Step 6: Final answer
   x = 108,604.01