Finding the Third Proportional to 5,211 and 8,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,211 : 8,086.50 = 8,086.50 : x
2. Step 2: Convert to fraction form
   5,211/8,086.50 = 8,086.50/x
3. Step 3: Cross multiply
   5,211x = 8,086.50 × 8,086.50
4. Step 4: Simplify right side
   5,211x = 65,391,482.25
5. Step 5: Solve for x
   x = 65,391,482.25/5,211
6. Step 6: Final answer
   x = 12,548.74