Finding the Third Proportional to 1,256.88 and 2,011.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,256.88 : 2,011.31 = 2,011.31 : x
2. Step 2: Convert to fraction form
   1,256.88/2,011.31 = 2,011.31/x
3. Step 3: Cross multiply
   1,256.88x = 2,011.31 × 2,011.31
4. Step 4: Simplify right side
   1,256.88x = 4,045,377.97
5. Step 5: Solve for x
   x = 4,045,377.97/1,256.88
6. Step 6: Final answer
   x = 3,218.60