Finding the Fourth Proportional to 139,229.24, 192,134.28 and 78,811.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139,229.24 : 192,134.28 = 78,811.34 : x
2. Step 2: Convert to fraction form
   139,229.24/192,134.28 = 78,811.34/x
3. Step 3: Cross multiply
   139,229.24x = 192,134.28 × 78,811.34
4. Step 4: Simplify right side
   139,229.24x = 15,142,360,066.74
5. Step 5: Solve for x
   x = 15,142,360,066.74/139,229.24
6. Step 6: Final answer
   x = 108,758.48