Finding the Fourth Proportional to 1,540.23, 2,311.74 and 718.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.23 : 2,311.74 = 718.98 : x
2. Step 2: Convert to fraction form
   1,540.23/2,311.74 = 718.98/x
3. Step 3: Cross multiply
   1,540.23x = 2,311.74 × 718.98
4. Step 4: Simplify right side
   1,540.23x = 1,662,094.83
5. Step 5: Solve for x
   x = 1,662,094.83/1,540.23
6. Step 6: Final answer
   x = 1,079.12