Finding the Third Proportional to 7,771.50 and 18,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   7,771.50 : 18,128.25 = 18,128.25 : x
2. Step 2: Convert to fraction form
   7,771.50/18,128.25 = 18,128.25/x
3. Step 3: Cross multiply
   7,771.50x = 18,128.25 × 18,128.25
4. Step 4: Simplify right side
   7,771.50x = 328,633,448.06
5. Step 5: Solve for x
   x = 328,633,448.06/7,771.50
6. Step 6: Final answer
   x = 42,287.00