Finding the Third Proportional to 12,210.75 and 21,900.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,210.75 : 21,900.38 = 21,900.38 : x
2. Step 2: Convert to fraction form
   12,210.75/21,900.38 = 21,900.38/x
3. Step 3: Cross multiply
   12,210.75x = 21,900.38 × 21,900.38
4. Step 4: Simplify right side
   12,210.75x = 479,626,425.14
5. Step 5: Solve for x
   x = 479,626,425.14/12,210.75
6. Step 6: Final answer
   x = 39,279.03