Finding the Third Proportional to 3,099.75 and 3,221.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,099.75 : 3,221.25 = 3,221.25 : x
2. Step 2: Convert to fraction form
   3,099.75/3,221.25 = 3,221.25/x
3. Step 3: Cross multiply
   3,099.75x = 3,221.25 × 3,221.25
4. Step 4: Simplify right side
   3,099.75x = 10,376,451.56
5. Step 5: Solve for x
   x = 10,376,451.56/3,099.75
6. Step 6: Final answer
   x = 3,347.51