Finding the Fourth Proportional to 12,136.64, 18,203.72 and 3,816.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,136.64 : 18,203.72 = 3,816.72 : x
2. Step 2: Convert to fraction form
   12,136.64/18,203.72 = 3,816.72/x
3. Step 3: Cross multiply
   12,136.64x = 18,203.72 × 3,816.72
4. Step 4: Simplify right side
   12,136.64x = 69,478,502.20
5. Step 5: Solve for x
   x = 69,478,502.20/12,136.64
6. Step 6: Final answer
   x = 5,724.69