Finding the Fourth Proportional to 139,051.59, 191,879.38 and 78,613.84

Step by Step Solution

1. Step 1: Write the proportion equation
   139,051.59 : 191,879.38 = 78,613.84 : x
2. Step 2: Convert to fraction form
   139,051.59/191,879.38 = 78,613.84/x
3. Step 3: Cross multiply
   139,051.59x = 191,879.38 × 78,613.84
4. Step 4: Simplify right side
   139,051.59x = 15,084,374,878.62
5. Step 5: Solve for x
   x = 15,084,374,878.62/139,051.59
6. Step 6: Final answer
   x = 108,480.42