Finding the Fourth Proportional to 1,242.72, 1,714.46 and 800.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.72 : 1,714.46 = 800.88 : x
2. Step 2: Convert to fraction form
   1,242.72/1,714.46 = 800.88/x
3. Step 3: Cross multiply
   1,242.72x = 1,714.46 × 800.88
4. Step 4: Simplify right side
   1,242.72x = 1,373,076.72
5. Step 5: Solve for x
   x = 1,373,076.72/1,242.72
6. Step 6: Final answer
   x = 1,104.90