Finding the Fourth Proportional to 1,242.72, 1,714.17 and 799.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.72 : 1,714.17 = 799.86 : x
2. Step 2: Convert to fraction form
   1,242.72/1,714.17 = 799.86/x
3. Step 3: Cross multiply
   1,242.72x = 1,714.17 × 799.86
4. Step 4: Simplify right side
   1,242.72x = 1,371,096.02
5. Step 5: Solve for x
   x = 1,371,096.02/1,242.72
6. Step 6: Final answer
   x = 1,103.30