Finding the Fourth Proportional to 12,131.32, 18,196.26 and 7,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,131.32 : 18,196.26 = 7,136.50 : x
2. Step 2: Convert to fraction form
   12,131.32/18,196.26 = 7,136.50/x
3. Step 3: Cross multiply
   12,131.32x = 18,196.26 × 7,136.50
4. Step 4: Simplify right side
   12,131.32x = 129,857,609.49
5. Step 5: Solve for x
   x = 129,857,609.49/12,131.32
6. Step 6: Final answer
   x = 10,704.33