Finding the Fourth Proportional to 139,051.71, 191,879.55 and 78,613.97

Step by Step Solution

1. Step 1: Write the proportion equation
   139,051.71 : 191,879.55 = 78,613.97 : x
2. Step 2: Convert to fraction form
   139,051.71/191,879.55 = 78,613.97/x
3. Step 3: Cross multiply
   139,051.71x = 191,879.55 × 78,613.97
4. Step 4: Simplify right side
   139,051.71x = 15,084,412,227.92
5. Step 5: Solve for x
   x = 15,084,412,227.92/139,051.71
6. Step 6: Final answer
   x = 108,480.59