Finding the Fourth Proportional to 10,785.61, 16,181.25 and 3,390.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,785.61 : 16,181.25 = 3,390.31 : x
2. Step 2: Convert to fraction form
   10,785.61/16,181.25 = 3,390.31/x
3. Step 3: Cross multiply
   10,785.61x = 16,181.25 × 3,390.31
4. Step 4: Simplify right side
   10,785.61x = 54,859,453.69
5. Step 5: Solve for x
   x = 54,859,453.69/10,785.61
6. Step 6: Final answer
   x = 5,086.36