Finding the Fourth Proportional to 123,269.51, 170,132.79 and 71,578.55

Step by Step Solution

1. Step 1: Write the proportion equation
   123,269.51 : 170,132.79 = 71,578.55 : x
2. Step 2: Convert to fraction form
   123,269.51/170,132.79 = 71,578.55/x
3. Step 3: Cross multiply
   123,269.51x = 170,132.79 × 71,578.55
4. Step 4: Simplify right side
   123,269.51x = 12,177,859,109.41
5. Step 5: Solve for x
   x = 12,177,859,109.41/123,269.51
6. Step 6: Final answer
   x = 98,790.52