Finding the Fourth Proportional to 1,243.55, 1,714.06 and 911.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.55 : 1,714.06 = 911.86 : x
2. Step 2: Convert to fraction form
   1,243.55/1,714.06 = 911.86/x
3. Step 3: Cross multiply
   1,243.55x = 1,714.06 × 911.86
4. Step 4: Simplify right side
   1,243.55x = 1,562,979.61
5. Step 5: Solve for x
   x = 1,562,979.61/1,243.55
6. Step 6: Final answer
   x = 1,256.87