Finding the Fourth Proportional to 22,550.81, 31,120.02 and 12,987.21

Step by Step Solution

1. Step 1: Write the proportion equation
   22,550.81 : 31,120.02 = 12,987.21 : x
2. Step 2: Convert to fraction form
   22,550.81/31,120.02 = 12,987.21/x
3. Step 3: Cross multiply
   22,550.81x = 31,120.02 × 12,987.21
4. Step 4: Simplify right side
   22,550.81x = 404,162,234.94
5. Step 5: Solve for x
   x = 404,162,234.94/22,550.81
6. Step 6: Final answer
   x = 17,922.29