Finding the Third Proportional to 643,458.50 and 1,398,980.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,458.50 : 1,398,980.50 = 1,398,980.50 : x
2. Step 2: Convert to fraction form
   643,458.50/1,398,980.50 = 1,398,980.50/x
3. Step 3: Cross multiply
   643,458.50x = 1,398,980.50 × 1,398,980.50
4. Step 4: Simplify right side
   643,458.50x = 1,957,146,439,380.25
5. Step 5: Solve for x
   x = 1,957,146,439,380.25/643,458.50
6. Step 6: Final answer
   x = 3,041,604.76