Finding the Fourth Proportional to 12,158.40, 18,224.82 and 5,136.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,158.40 : 18,224.82 = 5,136.96 : x
2. Step 2: Convert to fraction form
   12,158.40/18,224.82 = 5,136.96/x
3. Step 3: Cross multiply
   12,158.40x = 18,224.82 × 5,136.96
4. Step 4: Simplify right side
   12,158.40x = 93,620,171.35
5. Step 5: Solve for x
   x = 93,620,171.35/12,158.40
6. Step 6: Final answer
   x = 7,700.04