Finding the Third Proportional to 1,389 and 2,150.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389 : 2,150.25 = 2,150.25 : x
2. Step 2: Convert to fraction form
   1,389/2,150.25 = 2,150.25/x
3. Step 3: Cross multiply
   1,389x = 2,150.25 × 2,150.25
4. Step 4: Simplify right side
   1,389x = 4,623,575.06
5. Step 5: Solve for x
   x = 4,623,575.06/1,389
6. Step 6: Final answer
   x = 3,328.71