Finding the Fourth Proportional to 10,818, 16,221.69 and 4,242.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,818 : 16,221.69 = 4,242.42 : x
2. Step 2: Convert to fraction form
   10,818/16,221.69 = 4,242.42/x
3. Step 3: Cross multiply
   10,818x = 16,221.69 × 4,242.42
4. Step 4: Simplify right side
   10,818x = 68,819,222.09
5. Step 5: Solve for x
   x = 68,819,222.09/10,818
6. Step 6: Final answer
   x = 6,361.55