Finding the Fourth Proportional to 20,891.29, 31,345.14 and 9,196.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,891.29 : 31,345.14 = 9,196.31 : x
2. Step 2: Convert to fraction form
   20,891.29/31,345.14 = 9,196.31/x
3. Step 3: Cross multiply
   20,891.29x = 31,345.14 × 9,196.31
4. Step 4: Simplify right side
   20,891.29x = 288,259,624.43
5. Step 5: Solve for x
   x = 288,259,624.43/20,891.29
6. Step 6: Final answer
   x = 13,798.08