Finding the Fourth Proportional to 139,141.51, 192,015.35 and 78,710.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,141.51 : 192,015.35 = 78,710.86 : x
2. Step 2: Convert to fraction form
   139,141.51/192,015.35 = 78,710.86/x
3. Step 3: Cross multiply
   139,141.51x = 192,015.35 × 78,710.86
4. Step 4: Simplify right side
   139,141.51x = 15,113,693,331.70
5. Step 5: Solve for x
   x = 15,113,693,331.70/139,141.51
6. Step 6: Final answer
   x = 108,621.02