Finding the Third Proportional to 911.25 and 1,989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   911.25 : 1,989.56 = 1,989.56 : x
2. Step 2: Convert to fraction form
   911.25/1,989.56 = 1,989.56/x
3. Step 3: Cross multiply
   911.25x = 1,989.56 × 1,989.56
4. Step 4: Simplify right side
   911.25x = 3,958,358.94
5. Step 5: Solve for x
   x = 3,958,358.94/911.25
6. Step 6: Final answer
   x = 4,343.88