Finding the Third Proportional to 342,730 and 743,780

Step by Step Solution

1. Step 1: Write the proportion equation
   342,730 : 743,780 = 743,780 : x
2. Step 2: Convert to fraction form
   342,730/743,780 = 743,780/x
3. Step 3: Cross multiply
   342,730x = 743,780 × 743,780
4. Step 4: Simplify right side
   342,730x = 553,208,688,400
5. Step 5: Solve for x
   x = 553,208,688,400/342,730
6. Step 6: Final answer
   x = 1,614,123.91