Finding the Third Proportional to 1,012.50 and 1,289.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.50 : 1,289.25 = 1,289.25 : x
2. Step 2: Convert to fraction form
   1,012.50/1,289.25 = 1,289.25/x
3. Step 3: Cross multiply
   1,012.50x = 1,289.25 × 1,289.25
4. Step 4: Simplify right side
   1,012.50x = 1,662,165.56
5. Step 5: Solve for x
   x = 1,662,165.56/1,012.50
6. Step 6: Final answer
   x = 1,641.65