Finding the Fourth Proportional to 20,323.31, 30,408.41 and 13,111.67

Step by Step Solution

1. Step 1: Write the proportion equation
   20,323.31 : 30,408.41 = 13,111.67 : x
2. Step 2: Convert to fraction form
   20,323.31/30,408.41 = 13,111.67/x
3. Step 3: Cross multiply
   20,323.31x = 30,408.41 × 13,111.67
4. Step 4: Simplify right side
   20,323.31x = 398,705,145.94
5. Step 5: Solve for x
   x = 398,705,145.94/20,323.31
6. Step 6: Final answer
   x = 19,618.13