Finding the Fourth Proportional to 20,111.97, 30,169.49 and 5,320.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,111.97 : 30,169.49 = 5,320.50 : x
2. Step 2: Convert to fraction form
   20,111.97/30,169.49 = 5,320.50/x
3. Step 3: Cross multiply
   20,111.97x = 30,169.49 × 5,320.50
4. Step 4: Simplify right side
   20,111.97x = 160,516,771.55
5. Step 5: Solve for x
   x = 160,516,771.55/20,111.97
6. Step 6: Final answer
   x = 7,981.16