Finding the Fourth Proportional to 2,657.20, 3,985.50 and 709.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,657.20 : 3,985.50 = 709.25 : x
2. Step 2: Convert to fraction form
   2,657.20/3,985.50 = 709.25/x
3. Step 3: Cross multiply
   2,657.20x = 3,985.50 × 709.25
4. Step 4: Simplify right side
   2,657.20x = 2,826,712.33
5. Step 5: Solve for x
   x = 2,826,712.33/2,657.20
6. Step 6: Final answer
   x = 1,063.79