Finding the Fourth Proportional to 139,939.92, 193,007.88 and 89,643.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,939.92 : 193,007.88 = 89,643.60 : x
2. Step 2: Convert to fraction form
   139,939.92/193,007.88 = 89,643.60/x
3. Step 3: Cross multiply
   139,939.92x = 193,007.88 × 89,643.60
4. Step 4: Simplify right side
   139,939.92x = 17,301,921,191.57
5. Step 5: Solve for x
   x = 17,301,921,191.57/139,939.92
6. Step 6: Final answer
   x = 123,638.21