Finding the Third Proportional to 645,418 and 1,402,778

Step by Step Solution

1. Step 1: Write the proportion equation
   645,418 : 1,402,778 = 1,402,778 : x
2. Step 2: Convert to fraction form
   645,418/1,402,778 = 1,402,778/x
3. Step 3: Cross multiply
   645,418x = 1,402,778 × 1,402,778
4. Step 4: Simplify right side
   645,418x = 1,967,786,117,284
5. Step 5: Solve for x
   x = 1,967,786,117,284/645,418
6. Step 6: Final answer
   x = 3,048,855.34