Finding the Third Proportional to 399,150 and 619,746

Step by Step Solution

1. Step 1: Write the proportion equation
   399,150 : 619,746 = 619,746 : x
2. Step 2: Convert to fraction form
   399,150/619,746 = 619,746/x
3. Step 3: Cross multiply
   399,150x = 619,746 × 619,746
4. Step 4: Simplify right side
   399,150x = 384,085,104,516
5. Step 5: Solve for x
   x = 384,085,104,516/399,150
6. Step 6: Final answer
   x = 962,257.56