Finding the Third Proportional to 3,858 and 9,145.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,858 : 9,145.50 = 9,145.50 : x
2. Step 2: Convert to fraction form
   3,858/9,145.50 = 9,145.50/x
3. Step 3: Cross multiply
   3,858x = 9,145.50 × 9,145.50
4. Step 4: Simplify right side
   3,858x = 83,640,170.25
5. Step 5: Solve for x
   x = 83,640,170.25/3,858
6. Step 6: Final answer
   x = 21,679.67