Finding the Fourth Proportional to 10,886.91, 16,318.39 and 5,622.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,886.91 : 16,318.39 = 5,622.31 : x
2. Step 2: Convert to fraction form
   10,886.91/16,318.39 = 5,622.31/x
3. Step 3: Cross multiply
   10,886.91x = 16,318.39 × 5,622.31
4. Step 4: Simplify right side
   10,886.91x = 91,747,048.35
5. Step 5: Solve for x
   x = 91,747,048.35/10,886.91
6. Step 6: Final answer
   x = 8,427.28