Finding the Fourth Proportional to 22,621.65, 31,218.70 and 13,667.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,621.65 : 31,218.70 = 13,667.42 : x
2. Step 2: Convert to fraction form
   22,621.65/31,218.70 = 13,667.42/x
3. Step 3: Cross multiply
   22,621.65x = 31,218.70 × 13,667.42
4. Step 4: Simplify right side
   22,621.65x = 426,678,978.65
5. Step 5: Solve for x
   x = 426,678,978.65/22,621.65
6. Step 6: Final answer
   x = 18,861.54