Finding the Third Proportional to 668,391 and 1,443,321

Step by Step Solution

1. Step 1: Write the proportion equation
   668,391 : 1,443,321 = 1,443,321 : x
2. Step 2: Convert to fraction form
   668,391/1,443,321 = 1,443,321/x
3. Step 3: Cross multiply
   668,391x = 1,443,321 × 1,443,321
4. Step 4: Simplify right side
   668,391x = 2,083,175,509,041
5. Step 5: Solve for x
   x = 2,083,175,509,041/668,391
6. Step 6: Final answer
   x = 3,116,701.91