Finding the Third Proportional to 1,321.31 and 2,029.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.31 : 2,029.78 = 2,029.78 : x
2. Step 2: Convert to fraction form
   1,321.31/2,029.78 = 2,029.78/x
3. Step 3: Cross multiply
   1,321.31x = 2,029.78 × 2,029.78
4. Step 4: Simplify right side
   1,321.31x = 4,120,011.92
5. Step 5: Solve for x
   x = 4,120,011.92/1,321.31
6. Step 6: Final answer
   x = 3,118.12