Finding the Third Proportional to 18,726.19 and 40,231.69

Step by Step Solution

1. Step 1: Write the proportion equation
   18,726.19 : 40,231.69 = 40,231.69 : x
2. Step 2: Convert to fraction form
   18,726.19/40,231.69 = 40,231.69/x
3. Step 3: Cross multiply
   18,726.19x = 40,231.69 × 40,231.69
4. Step 4: Simplify right side
   18,726.19x = 1,618,588,679.10
5. Step 5: Solve for x
   x = 1,618,588,679.10/18,726.19
6. Step 6: Final answer
   x = 86,434.50