Finding the Third Proportional to 643,400 and 1,413,700

Step by Step Solution

1. Step 1: Write the proportion equation
   643,400 : 1,413,700 = 1,413,700 : x
2. Step 2: Convert to fraction form
   643,400/1,413,700 = 1,413,700/x
3. Step 3: Cross multiply
   643,400x = 1,413,700 × 1,413,700
4. Step 4: Simplify right side
   643,400x = 1,998,547,690,000
5. Step 5: Solve for x
   x = 1,998,547,690,000/643,400
6. Step 6: Final answer
   x = 3,106,228.92