Finding the Third Proportional to 589 and 1,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   589 : 1,287.50 = 1,287.50 : x
2. Step 2: Convert to fraction form
   589/1,287.50 = 1,287.50/x
3. Step 3: Cross multiply
   589x = 1,287.50 × 1,287.50
4. Step 4: Simplify right side
   589x = 1,657,656.25
5. Step 5: Solve for x
   x = 1,657,656.25/589
6. Step 6: Final answer
   x = 2,814.36