Finding the Third Proportional to 643,466 and 1,385,590

Step by Step Solution

1. Step 1: Write the proportion equation
   643,466 : 1,385,590 = 1,385,590 : x
2. Step 2: Convert to fraction form
   643,466/1,385,590 = 1,385,590/x
3. Step 3: Cross multiply
   643,466x = 1,385,590 × 1,385,590
4. Step 4: Simplify right side
   643,466x = 1,919,859,648,100
5. Step 5: Solve for x
   x = 1,919,859,648,100/643,466
6. Step 6: Final answer
   x = 2,983,622.52