Finding the Third Proportional to 680.91 and 1,031.48

Step by Step Solution

1. Step 1: Write the proportion equation
   680.91 : 1,031.48 = 1,031.48 : x
2. Step 2: Convert to fraction form
   680.91/1,031.48 = 1,031.48/x
3. Step 3: Cross multiply
   680.91x = 1,031.48 × 1,031.48
4. Step 4: Simplify right side
   680.91x = 1,063,960.02
5. Step 5: Solve for x
   x = 1,063,960.02/680.91
6. Step 6: Final answer
   x = 1,562.56