Finding the Fourth Proportional to 10,911.05, 16,369.42 and 3,120.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,911.05 : 16,369.42 = 3,120.47 : x
2. Step 2: Convert to fraction form
   10,911.05/16,369.42 = 3,120.47/x
3. Step 3: Cross multiply
   10,911.05x = 16,369.42 × 3,120.47
4. Step 4: Simplify right side
   10,911.05x = 51,080,284.03
5. Step 5: Solve for x
   x = 51,080,284.03/10,911.05
6. Step 6: Final answer
   x = 4,681.52