Finding the Fourth Proportional to 123,608.72, 170,531.79 and 80,638.73

Step by Step Solution

1. Step 1: Write the proportion equation
   123,608.72 : 170,531.79 = 80,638.73 : x
2. Step 2: Convert to fraction form
   123,608.72/170,531.79 = 80,638.73/x
3. Step 3: Cross multiply
   123,608.72x = 170,531.79 × 80,638.73
4. Step 4: Simplify right side
   123,608.72x = 13,751,466,970.23
5. Step 5: Solve for x
   x = 13,751,466,970.23/123,608.72
6. Step 6: Final answer
   x = 111,249.97