Finding the Third Proportional to 866.25 and 1,298.25

Step by Step Solution

1. Step 1: Write the proportion equation
   866.25 : 1,298.25 = 1,298.25 : x
2. Step 2: Convert to fraction form
   866.25/1,298.25 = 1,298.25/x
3. Step 3: Cross multiply
   866.25x = 1,298.25 × 1,298.25
4. Step 4: Simplify right side
   866.25x = 1,685,453.06
5. Step 5: Solve for x
   x = 1,685,453.06/866.25
6. Step 6: Final answer
   x = 1,945.69