Finding the Third Proportional to 619.50 and 979.88

Step by Step Solution

1. Step 1: Write the proportion equation
   619.50 : 979.88 = 979.88 : x
2. Step 2: Convert to fraction form
   619.50/979.88 = 979.88/x
3. Step 3: Cross multiply
   619.50x = 979.88 × 979.88
4. Step 4: Simplify right side
   619.50x = 960,155.02
5. Step 5: Solve for x
   x = 960,155.02/619.50
6. Step 6: Final answer
   x = 1,549.89