Finding the Third Proportional to 642,778 and 1,335,376

Step by Step Solution

1. Step 1: Write the proportion equation
   642,778 : 1,335,376 = 1,335,376 : x
2. Step 2: Convert to fraction form
   642,778/1,335,376 = 1,335,376/x
3. Step 3: Cross multiply
   642,778x = 1,335,376 × 1,335,376
4. Step 4: Simplify right side
   642,778x = 1,783,229,061,376
5. Step 5: Solve for x
   x = 1,783,229,061,376/642,778
6. Step 6: Final answer
   x = 2,774,253.41