Finding the Third Proportional to 639,520 and 1,367,656

Step by Step Solution

1. Step 1: Write the proportion equation
   639,520 : 1,367,656 = 1,367,656 : x
2. Step 2: Convert to fraction form
   639,520/1,367,656 = 1,367,656/x
3. Step 3: Cross multiply
   639,520x = 1,367,656 × 1,367,656
4. Step 4: Simplify right side
   639,520x = 1,870,482,934,336
5. Step 5: Solve for x
   x = 1,870,482,934,336/639,520
6. Step 6: Final answer
   x = 2,924,823.20