Finding the Third Proportional to 12,386.81 and 21,864.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,386.81 : 21,864.38 = 21,864.38 : x
2. Step 2: Convert to fraction form
   12,386.81/21,864.38 = 21,864.38/x
3. Step 3: Cross multiply
   12,386.81x = 21,864.38 × 21,864.38
4. Step 4: Simplify right side
   12,386.81x = 478,050,894.14
5. Step 5: Solve for x
   x = 478,050,894.14/12,386.81
6. Step 6: Final answer
   x = 38,593.54