Finding the Fourth Proportional to 139,215.68, 192,114.56 and 78,778.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,215.68 : 192,114.56 = 78,778.24 : x
2. Step 2: Convert to fraction form
   139,215.68/192,114.56 = 78,778.24/x
3. Step 3: Cross multiply
   139,215.68x = 192,114.56 × 78,778.24
4. Step 4: Simplify right side
   139,215.68x = 15,134,446,915.17
5. Step 5: Solve for x
   x = 15,134,446,915.17/139,215.68
6. Step 6: Final answer
   x = 108,712.23