Finding the Third Proportional to 6,990.75 and 10,391.25

Step by Step Solution

1. Step 1: Write the proportion equation
   6,990.75 : 10,391.25 = 10,391.25 : x
2. Step 2: Convert to fraction form
   6,990.75/10,391.25 = 10,391.25/x
3. Step 3: Cross multiply
   6,990.75x = 10,391.25 × 10,391.25
4. Step 4: Simplify right side
   6,990.75x = 107,978,076.56
5. Step 5: Solve for x
   x = 107,978,076.56/6,990.75
6. Step 6: Final answer
   x = 15,445.85