Finding the Fourth Proportional to 139,792.60, 192,921.89 and 105,275.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,792.60 : 192,921.89 = 105,275.52 : x
2. Step 2: Convert to fraction form
   139,792.60/192,921.89 = 105,275.52/x
3. Step 3: Cross multiply
   139,792.60x = 192,921.89 × 105,275.52
4. Step 4: Simplify right side
   139,792.60x = 20,309,952,289.13
5. Step 5: Solve for x
   x = 20,309,952,289.13/139,792.60
6. Step 6: Final answer
   x = 145,286.32