Finding the Third Proportional to 615.30 and 1,321.73

Step by Step Solution

1. Step 1: Write the proportion equation
   615.30 : 1,321.73 = 1,321.73 : x
2. Step 2: Convert to fraction form
   615.30/1,321.73 = 1,321.73/x
3. Step 3: Cross multiply
   615.30x = 1,321.73 × 1,321.73
4. Step 4: Simplify right side
   615.30x = 1,746,981.76
5. Step 5: Solve for x
   x = 1,746,981.76/615.30
6. Step 6: Final answer
   x = 2,839.21