Finding the Fourth Proportional to 12,109.50, 18,165.36 and 4,213.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.50 : 18,165.36 = 4,213.42 : x
2. Step 2: Convert to fraction form
   12,109.50/18,165.36 = 4,213.42/x
3. Step 3: Cross multiply
   12,109.50x = 18,165.36 × 4,213.42
4. Step 4: Simplify right side
   12,109.50x = 76,538,261.52
5. Step 5: Solve for x
   x = 76,538,261.52/12,109.50
6. Step 6: Final answer
   x = 6,320.51