Finding the Fourth Proportional to 12,261.42, 18,390.38 and 3,940.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,261.42 : 18,390.38 = 3,940.34 : x
2. Step 2: Convert to fraction form
   12,261.42/18,390.38 = 3,940.34/x
3. Step 3: Cross multiply
   12,261.42x = 18,390.38 × 3,940.34
4. Step 4: Simplify right side
   12,261.42x = 72,464,341.72
5. Step 5: Solve for x
   x = 72,464,341.72/12,261.42
6. Step 6: Final answer
   x = 5,909.95