Finding the Third Proportional to 643,418 and 1,392,748

Step by Step Solution

1. Step 1: Write the proportion equation
   643,418 : 1,392,748 = 1,392,748 : x
2. Step 2: Convert to fraction form
   643,418/1,392,748 = 1,392,748/x
3. Step 3: Cross multiply
   643,418x = 1,392,748 × 1,392,748
4. Step 4: Simplify right side
   643,418x = 1,939,746,991,504
5. Step 5: Solve for x
   x = 1,939,746,991,504/643,418
6. Step 6: Final answer
   x = 3,014,754.00