Finding the Fourth Proportional to 1,540.27, 2,309.46 and 718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.27 : 2,309.46 = 718.72 : x
2. Step 2: Convert to fraction form
   1,540.27/2,309.46 = 718.72/x
3. Step 3: Cross multiply
   1,540.27x = 2,309.46 × 718.72
4. Step 4: Simplify right side
   1,540.27x = 1,659,855.09
5. Step 5: Solve for x
   x = 1,659,855.09/1,540.27
6. Step 6: Final answer
   x = 1,077.64