Finding the Third Proportional to 645,408 and 1,402,758

Step by Step Solution

1. Step 1: Write the proportion equation
   645,408 : 1,402,758 = 1,402,758 : x
2. Step 2: Convert to fraction form
   645,408/1,402,758 = 1,402,758/x
3. Step 3: Cross multiply
   645,408x = 1,402,758 × 1,402,758
4. Step 4: Simplify right side
   645,408x = 1,967,730,006,564
5. Step 5: Solve for x
   x = 1,967,730,006,564/645,408
6. Step 6: Final answer
   x = 3,048,815.64