Finding the Fourth Proportional to 22,621.53, 31,218.55 and 13,667.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,621.53 : 31,218.55 = 13,667.31 : x
2. Step 2: Convert to fraction form
   22,621.53/31,218.55 = 13,667.31/x
3. Step 3: Cross multiply
   22,621.53x = 31,218.55 × 13,667.31
4. Step 4: Simplify right side
   22,621.53x = 426,673,536.29
5. Step 5: Solve for x
   x = 426,673,536.29/22,621.53
6. Step 6: Final answer
   x = 18,861.39