Finding the Third Proportional to 11,891.81 and 21,171.38

Step by Step Solution

1. Step 1: Write the proportion equation
   11,891.81 : 21,171.38 = 21,171.38 : x
2. Step 2: Convert to fraction form
   11,891.81/21,171.38 = 21,171.38/x
3. Step 3: Cross multiply
   11,891.81x = 21,171.38 × 21,171.38
4. Step 4: Simplify right side
   11,891.81x = 448,227,119.39
5. Step 5: Solve for x
   x = 448,227,119.39/11,891.81
6. Step 6: Final answer
   x = 37,692.08