Finding the Fourth Proportional to 20,920.72, 31,382.16 and 5,338.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,920.72 : 31,382.16 = 5,338.48 : x
2. Step 2: Convert to fraction form
   20,920.72/31,382.16 = 5,338.48/x
3. Step 3: Cross multiply
   20,920.72x = 31,382.16 × 5,338.48
4. Step 4: Simplify right side
   20,920.72x = 167,533,033.52
5. Step 5: Solve for x
   x = 167,533,033.52/20,920.72
6. Step 6: Final answer
   x = 8,008.00