Finding the Third Proportional to 435,670 and 666,321

Step by Step Solution

1. Step 1: Write the proportion equation
   435,670 : 666,321 = 666,321 : x
2. Step 2: Convert to fraction form
   435,670/666,321 = 666,321/x
3. Step 3: Cross multiply
   435,670x = 666,321 × 666,321
4. Step 4: Simplify right side
   435,670x = 443,983,675,041
5. Step 5: Solve for x
   x = 443,983,675,041/435,670
6. Step 6: Final answer
   x = 1,019,082.51