Finding the Fourth Proportional to 123,639.30, 170,573.94 and 80,669.34

Step by Step Solution

1. Step 1: Write the proportion equation
   123,639.30 : 170,573.94 = 80,669.34 : x
2. Step 2: Convert to fraction form
   123,639.30/170,573.94 = 80,669.34/x
3. Step 3: Cross multiply
   123,639.30x = 170,573.94 × 80,669.34
4. Step 4: Simplify right side
   123,639.30x = 13,760,087,161.00
5. Step 5: Solve for x
   x = 13,760,087,161.00/123,639.30
6. Step 6: Final answer
   x = 111,292.18