Finding the Third Proportional to 402.25 and 879.25

Step by Step Solution

1. Step 1: Write the proportion equation
   402.25 : 879.25 = 879.25 : x
2. Step 2: Convert to fraction form
   402.25/879.25 = 879.25/x
3. Step 3: Cross multiply
   402.25x = 879.25 × 879.25
4. Step 4: Simplify right side
   402.25x = 773,080.56
5. Step 5: Solve for x
   x = 773,080.56/402.25
6. Step 6: Final answer
   x = 1,921.89