Finding the Third Proportional to 645,422 and 1,402,786

Step by Step Solution

1. Step 1: Write the proportion equation
   645,422 : 1,402,786 = 1,402,786 : x
2. Step 2: Convert to fraction form
   645,422/1,402,786 = 1,402,786/x
3. Step 3: Cross multiply
   645,422x = 1,402,786 × 1,402,786
4. Step 4: Simplify right side
   645,422x = 1,967,808,561,796
5. Step 5: Solve for x
   x = 1,967,808,561,796/645,422
6. Step 6: Final answer
   x = 3,048,871.22