Finding the Fourth Proportional to 10,821.16, 16,234.18 and 3,426.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,821.16 : 16,234.18 = 3,426.07 : x
2. Step 2: Convert to fraction form
   10,821.16/16,234.18 = 3,426.07/x
3. Step 3: Cross multiply
   10,821.16x = 16,234.18 × 3,426.07
4. Step 4: Simplify right side
   10,821.16x = 55,619,437.07
5. Step 5: Solve for x
   x = 55,619,437.07/10,821.16
6. Step 6: Final answer
   x = 5,139.88