Finding the Third Proportional to 1,285.31 and 2,808.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,285.31 : 2,808.28 = 2,808.28 : x
2. Step 2: Convert to fraction form
   1,285.31/2,808.28 = 2,808.28/x
3. Step 3: Cross multiply
   1,285.31x = 2,808.28 × 2,808.28
4. Step 4: Simplify right side
   1,285.31x = 7,886,443.58
5. Step 5: Solve for x
   x = 7,886,443.58/1,285.31
6. Step 6: Final answer
   x = 6,135.82