Finding the Third Proportional to 643,764 and 1,385,700

Step by Step Solution

1. Step 1: Write the proportion equation
   643,764 : 1,385,700 = 1,385,700 : x
2. Step 2: Convert to fraction form
   643,764/1,385,700 = 1,385,700/x
3. Step 3: Cross multiply
   643,764x = 1,385,700 × 1,385,700
4. Step 4: Simplify right side
   643,764x = 1,920,164,490,000
5. Step 5: Solve for x
   x = 1,920,164,490,000/643,764
6. Step 6: Final answer
   x = 2,982,714.92