Finding the Third Proportional to 646,611 and 1,405,142

Step by Step Solution

1. Step 1: Write the proportion equation
   646,611 : 1,405,142 = 1,405,142 : x
2. Step 2: Convert to fraction form
   646,611/1,405,142 = 1,405,142/x
3. Step 3: Cross multiply
   646,611x = 1,405,142 × 1,405,142
4. Step 4: Simplify right side
   646,611x = 1,974,424,040,164
5. Step 5: Solve for x
   x = 1,974,424,040,164/646,611
6. Step 6: Final answer
   x = 3,053,495.90