Finding the Third Proportional to 3,922.50 and 8,391.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,922.50 : 8,391.75 = 8,391.75 : x
2. Step 2: Convert to fraction form
   3,922.50/8,391.75 = 8,391.75/x
3. Step 3: Cross multiply
   3,922.50x = 8,391.75 × 8,391.75
4. Step 4: Simplify right side
   3,922.50x = 70,421,468.06
5. Step 5: Solve for x
   x = 70,421,468.06/3,922.50
6. Step 6: Final answer
   x = 17,953.21