Finding the Third Proportional to 639,196 and 1,420,280

Step by Step Solution

1. Step 1: Write the proportion equation
   639,196 : 1,420,280 = 1,420,280 : x
2. Step 2: Convert to fraction form
   639,196/1,420,280 = 1,420,280/x
3. Step 3: Cross multiply
   639,196x = 1,420,280 × 1,420,280
4. Step 4: Simplify right side
   639,196x = 2,017,195,278,400
5. Step 5: Solve for x
   x = 2,017,195,278,400/639,196
6. Step 6: Final answer
   x = 3,155,832.14