Finding the Fourth Proportional to 139,718.83, 192,385.01 and 105,313.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,718.83 : 192,385.01 = 105,313.55 : x
2. Step 2: Convert to fraction form
   139,718.83/192,385.01 = 105,313.55/x
3. Step 3: Cross multiply
   139,718.83x = 192,385.01 × 105,313.55
4. Step 4: Simplify right side
   139,718.83x = 20,260,748,369.89
5. Step 5: Solve for x
   x = 20,260,748,369.89/139,718.83
6. Step 6: Final answer
   x = 145,010.86