Finding the Third Proportional to 670.31 and 1,009.69

Step by Step Solution

1. Step 1: Write the proportion equation
   670.31 : 1,009.69 = 1,009.69 : x
2. Step 2: Convert to fraction form
   670.31/1,009.69 = 1,009.69/x
3. Step 3: Cross multiply
   670.31x = 1,009.69 × 1,009.69
4. Step 4: Simplify right side
   670.31x = 1,019,468.85
5. Step 5: Solve for x
   x = 1,019,468.85/670.31
6. Step 6: Final answer
   x = 1,520.89