Finding the Third Proportional to 639,616 and 954,240

Step by Step Solution

1. Step 1: Write the proportion equation
   639,616 : 954,240 = 954,240 : x
2. Step 2: Convert to fraction form
   639,616/954,240 = 954,240/x
3. Step 3: Cross multiply
   639,616x = 954,240 × 954,240
4. Step 4: Simplify right side
   639,616x = 910,573,977,600
5. Step 5: Solve for x
   x = 910,573,977,600/639,616
6. Step 6: Final answer
   x = 1,423,626.02