Finding the Third Proportional to 3,868.75 and 9,039.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,868.75 : 9,039.50 = 9,039.50 : x
2. Step 2: Convert to fraction form
   3,868.75/9,039.50 = 9,039.50/x
3. Step 3: Cross multiply
   3,868.75x = 9,039.50 × 9,039.50
4. Step 4: Simplify right side
   3,868.75x = 81,712,560.25
5. Step 5: Solve for x
   x = 81,712,560.25/3,868.75
6. Step 6: Final answer
   x = 21,121.18