Finding the Third Proportional to 623,748 and 1,290,280

Step by Step Solution

1. Step 1: Write the proportion equation
   623,748 : 1,290,280 = 1,290,280 : x
2. Step 2: Convert to fraction form
   623,748/1,290,280 = 1,290,280/x
3. Step 3: Cross multiply
   623,748x = 1,290,280 × 1,290,280
4. Step 4: Simplify right side
   623,748x = 1,664,822,478,400
5. Step 5: Solve for x
   x = 1,664,822,478,400/623,748
6. Step 6: Final answer
   x = 2,669,062.63