Finding the Third Proportional to 399,076 and 619,600

Step by Step Solution

1. Step 1: Write the proportion equation
   399,076 : 619,600 = 619,600 : x
2. Step 2: Convert to fraction form
   399,076/619,600 = 619,600/x
3. Step 3: Cross multiply
   399,076x = 619,600 × 619,600
4. Step 4: Simplify right side
   399,076x = 383,904,160,000
5. Step 5: Solve for x
   x = 383,904,160,000/399,076
6. Step 6: Final answer
   x = 961,982.58