Finding the Fourth Proportional to 139,321.28, 192,275.34 and 78,902.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,321.28 : 192,275.34 = 78,902.58 : x
2. Step 2: Convert to fraction form
   139,321.28/192,275.34 = 78,902.58/x
3. Step 3: Cross multiply
   139,321.28x = 192,275.34 × 78,902.58
4. Step 4: Simplify right side
   139,321.28x = 15,171,020,396.38
5. Step 5: Solve for x
   x = 15,171,020,396.38/139,321.28
6. Step 6: Final answer
   x = 108,892.34