Finding the Third Proportional to 1,228.50 and 1,617.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.50 : 1,617.38 = 1,617.38 : x
2. Step 2: Convert to fraction form
   1,228.50/1,617.38 = 1,617.38/x
3. Step 3: Cross multiply
   1,228.50x = 1,617.38 × 1,617.38
4. Step 4: Simplify right side
   1,228.50x = 2,615,901.89
5. Step 5: Solve for x
   x = 2,615,901.89/1,228.50
6. Step 6: Final answer
   x = 2,129.35