Finding the Third Proportional to 672 and 1,231.50

Step by Step Solution

1. Step 1: Write the proportion equation
   672 : 1,231.50 = 1,231.50 : x
2. Step 2: Convert to fraction form
   672/1,231.50 = 1,231.50/x
3. Step 3: Cross multiply
   672x = 1,231.50 × 1,231.50
4. Step 4: Simplify right side
   672x = 1,516,592.25
5. Step 5: Solve for x
   x = 1,516,592.25/672
6. Step 6: Final answer
   x = 2,256.83