Finding the Fourth Proportional to 10,918.84, 16,380.42 and 3,993.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,918.84 : 16,380.42 = 3,993.88 : x
2. Step 2: Convert to fraction form
   10,918.84/16,380.42 = 3,993.88/x
3. Step 3: Cross multiply
   10,918.84x = 16,380.42 × 3,993.88
4. Step 4: Simplify right side
   10,918.84x = 65,421,431.83
5. Step 5: Solve for x
   x = 65,421,431.83/10,918.84
6. Step 6: Final answer
   x = 5,991.61