Finding the Third Proportional to 621.32 and 1,328.59

Step by Step Solution

1. Step 1: Write the proportion equation
   621.32 : 1,328.59 = 1,328.59 : x
2. Step 2: Convert to fraction form
   621.32/1,328.59 = 1,328.59/x
3. Step 3: Cross multiply
   621.32x = 1,328.59 × 1,328.59
4. Step 4: Simplify right side
   621.32x = 1,765,150.97
5. Step 5: Solve for x
   x = 1,765,150.97/621.32
6. Step 6: Final answer
   x = 2,840.99