Finding the Fourth Proportional to 1,242.27, 1,714.37 and 718.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.27 : 1,714.37 = 718.34 : x
2. Step 2: Convert to fraction form
   1,242.27/1,714.37 = 718.34/x
3. Step 3: Cross multiply
   1,242.27x = 1,714.37 × 718.34
4. Step 4: Simplify right side
   1,242.27x = 1,231,488.38
5. Step 5: Solve for x
   x = 1,231,488.38/1,242.27
6. Step 6: Final answer
   x = 991.32