Finding the Third Proportional to 638,280 and 1,382,940

Step by Step Solution

1. Step 1: Write the proportion equation
   638,280 : 1,382,940 = 1,382,940 : x
2. Step 2: Convert to fraction form
   638,280/1,382,940 = 1,382,940/x
3. Step 3: Cross multiply
   638,280x = 1,382,940 × 1,382,940
4. Step 4: Simplify right side
   638,280x = 1,912,523,043,600
5. Step 5: Solve for x
   x = 1,912,523,043,600/638,280
6. Step 6: Final answer
   x = 2,996,370