Finding the Fourth Proportional to 22,188.72, 30,624.48 and 13,236.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,188.72 : 30,624.48 = 13,236.72 : x
2. Step 2: Convert to fraction form
   22,188.72/30,624.48 = 13,236.72/x
3. Step 3: Cross multiply
   22,188.72x = 30,624.48 × 13,236.72
4. Step 4: Simplify right side
   22,188.72x = 405,367,666.91
5. Step 5: Solve for x
   x = 405,367,666.91/22,188.72
6. Step 6: Final answer
   x = 18,269.09