Finding the Fourth Proportional to 139,938.92, 193,006.50 and 89,642.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,938.92 : 193,006.50 = 89,642.60 : x
2. Step 2: Convert to fraction form
   139,938.92/193,006.50 = 89,642.60/x
3. Step 3: Cross multiply
   139,938.92x = 193,006.50 × 89,642.60
4. Step 4: Simplify right side
   139,938.92x = 17,301,604,476.90
5. Step 5: Solve for x
   x = 17,301,604,476.90/139,938.92
6. Step 6: Final answer
   x = 123,636.83