Finding the Third Proportional to 4,151.25 and 8,815.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,151.25 : 8,815.50 = 8,815.50 : x
2. Step 2: Convert to fraction form
   4,151.25/8,815.50 = 8,815.50/x
3. Step 3: Cross multiply
   4,151.25x = 8,815.50 × 8,815.50
4. Step 4: Simplify right side
   4,151.25x = 77,713,040.25
5. Step 5: Solve for x
   x = 77,713,040.25/4,151.25
6. Step 6: Final answer
   x = 18,720.40