Finding the Third Proportional to 810 and 1,258.50

Step by Step Solution

1. Step 1: Write the proportion equation
   810 : 1,258.50 = 1,258.50 : x
2. Step 2: Convert to fraction form
   810/1,258.50 = 1,258.50/x
3. Step 3: Cross multiply
   810x = 1,258.50 × 1,258.50
4. Step 4: Simplify right side
   810x = 1,583,822.25
5. Step 5: Solve for x
   x = 1,583,822.25/810
6. Step 6: Final answer
   x = 1,955.34