Finding the Fourth Proportional to 16,120.72, 22,235.40 and 13,136.56

Step by Step Solution

1. Step 1: Write the proportion equation
   16,120.72 : 22,235.40 = 13,136.56 : x
2. Step 2: Convert to fraction form
   16,120.72/22,235.40 = 13,136.56/x
3. Step 3: Cross multiply
   16,120.72x = 22,235.40 × 13,136.56
4. Step 4: Simplify right side
   16,120.72x = 292,096,666.22
5. Step 5: Solve for x
   x = 292,096,666.22/16,120.72
6. Step 6: Final answer
   x = 18,119.33