Finding the Fourth Proportional to 1,242.52, 1,714.56 and 718.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.52 : 1,714.56 = 718.48 : x
2. Step 2: Convert to fraction form
   1,242.52/1,714.56 = 718.48/x
3. Step 3: Cross multiply
   1,242.52x = 1,714.56 × 718.48
4. Step 4: Simplify right side
   1,242.52x = 1,231,877.07
5. Step 5: Solve for x
   x = 1,231,877.07/1,242.52
6. Step 6: Final answer
   x = 991.43