Finding the Third Proportional to 5,199.33 and 7,991.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,199.33 : 7,991.86 = 7,991.86 : x
2. Step 2: Convert to fraction form
   5,199.33/7,991.86 = 7,991.86/x
3. Step 3: Cross multiply
   5,199.33x = 7,991.86 × 7,991.86
4. Step 4: Simplify right side
   5,199.33x = 63,869,816.27
5. Step 5: Solve for x
   x = 63,869,816.27/5,199.33
6. Step 6: Final answer
   x = 12,284.24