Finding the Third Proportional to 647,358 and 1,423,200

Step by Step Solution

1. Step 1: Write the proportion equation
   647,358 : 1,423,200 = 1,423,200 : x
2. Step 2: Convert to fraction form
   647,358/1,423,200 = 1,423,200/x
3. Step 3: Cross multiply
   647,358x = 1,423,200 × 1,423,200
4. Step 4: Simplify right side
   647,358x = 2,025,498,240,000
5. Step 5: Solve for x
   x = 2,025,498,240,000/647,358
6. Step 6: Final answer
   x = 3,128,868.79