Finding the Fourth Proportional to 10,867.61, 16,291.56 and 3,940.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,867.61 : 16,291.56 = 3,940.49 : x
2. Step 2: Convert to fraction form
   10,867.61/16,291.56 = 3,940.49/x
3. Step 3: Cross multiply
   10,867.61x = 16,291.56 × 3,940.49
4. Step 4: Simplify right side
   10,867.61x = 64,196,729.26
5. Step 5: Solve for x
   x = 64,196,729.26/10,867.61
6. Step 6: Final answer
   x = 5,907.16