Finding the Fourth Proportional to 11,061.20, 16,591.50 and 4,821.21

Step by Step Solution

1. Step 1: Write the proportion equation
   11,061.20 : 16,591.50 = 4,821.21 : x
2. Step 2: Convert to fraction form
   11,061.20/16,591.50 = 4,821.21/x
3. Step 3: Cross multiply
   11,061.20x = 16,591.50 × 4,821.21
4. Step 4: Simplify right side
   11,061.20x = 79,991,105.72
5. Step 5: Solve for x
   x = 79,991,105.72/11,061.20
6. Step 6: Final answer
   x = 7,231.68