Finding the Third Proportional to 619.78 and 1,359.38

Step by Step Solution

1. Step 1: Write the proportion equation
   619.78 : 1,359.38 = 1,359.38 : x
2. Step 2: Convert to fraction form
   619.78/1,359.38 = 1,359.38/x
3. Step 3: Cross multiply
   619.78x = 1,359.38 × 1,359.38
4. Step 4: Simplify right side
   619.78x = 1,847,900.39
5. Step 5: Solve for x
   x = 1,847,900.39/619.78
6. Step 6: Final answer
   x = 2,981.54