Finding the Third Proportional to 312.61 and 672.52

Step by Step Solution

1. Step 1: Write the proportion equation
   312.61 : 672.52 = 672.52 : x
2. Step 2: Convert to fraction form
   312.61/672.52 = 672.52/x
3. Step 3: Cross multiply
   312.61x = 672.52 × 672.52
4. Step 4: Simplify right side
   312.61x = 452,277.27
5. Step 5: Solve for x
   x = 452,277.27/312.61
6. Step 6: Final answer
   x = 1,446.78