Finding the Third Proportional to 3,891 and 5,551.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,891 : 5,551.50 = 5,551.50 : x
2. Step 2: Convert to fraction form
   3,891/5,551.50 = 5,551.50/x
3. Step 3: Cross multiply
   3,891x = 5,551.50 × 5,551.50
4. Step 4: Simplify right side
   3,891x = 30,819,152.25
5. Step 5: Solve for x
   x = 30,819,152.25/3,891
6. Step 6: Final answer
   x = 7,920.63