Finding the Fourth Proportional to 1,540.98, 2,309.31 and 717.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.98 : 2,309.31 = 717.30 : x
2. Step 2: Convert to fraction form
   1,540.98/2,309.31 = 717.30/x
3. Step 3: Cross multiply
   1,540.98x = 2,309.31 × 717.30
4. Step 4: Simplify right side
   1,540.98x = 1,656,468.06
5. Step 5: Solve for x
   x = 1,656,468.06/1,540.98
6. Step 6: Final answer
   x = 1,074.94