Finding the Third Proportional to 643,945.50 and 1,398,600

Step by Step Solution

1. Step 1: Write the proportion equation
   643,945.50 : 1,398,600 = 1,398,600 : x
2. Step 2: Convert to fraction form
   643,945.50/1,398,600 = 1,398,600/x
3. Step 3: Cross multiply
   643,945.50x = 1,398,600 × 1,398,600
4. Step 4: Simplify right side
   643,945.50x = 1,956,081,960,000
5. Step 5: Solve for x
   x = 1,956,081,960,000/643,945.50
6. Step 6: Final answer
   x = 3,037,651.42