Finding the Third Proportional to 639,396 and 954,706.50

Step by Step Solution

1. Step 1: Write the proportion equation
   639,396 : 954,706.50 = 954,706.50 : x
2. Step 2: Convert to fraction form
   639,396/954,706.50 = 954,706.50/x
3. Step 3: Cross multiply
   639,396x = 954,706.50 × 954,706.50
4. Step 4: Simplify right side
   639,396x = 911,464,501,142.25
5. Step 5: Solve for x
   x = 911,464,501,142.25/639,396
6. Step 6: Final answer
   x = 1,425,508.61