Finding the Fourth Proportional to 139,957.92, 193,032.72 and 89,661.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,957.92 : 193,032.72 = 89,661.60 : x
2. Step 2: Convert to fraction form
   139,957.92/193,032.72 = 89,661.60/x
3. Step 3: Cross multiply
   139,957.92x = 193,032.72 × 89,661.60
4. Step 4: Simplify right side
   139,957.92x = 17,307,622,527.55
5. Step 5: Solve for x
   x = 17,307,622,527.55/139,957.92
6. Step 6: Final answer
   x = 123,663.04