Finding the Fourth Proportional to 21,036.66, 31,382.72 and 20,464.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,036.66 : 31,382.72 = 20,464.67 : x
2. Step 2: Convert to fraction form
   21,036.66/31,382.72 = 20,464.67/x
3. Step 3: Cross multiply
   21,036.66x = 31,382.72 × 20,464.67
4. Step 4: Simplify right side
   21,036.66x = 642,236,749.27
5. Step 5: Solve for x
   x = 642,236,749.27/21,036.66
6. Step 6: Final answer
   x = 30,529.41