Finding the Fourth Proportional to 12,290.72, 18,434.51 and 3,969.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,290.72 : 18,434.51 = 3,969.87 : x
2. Step 2: Convert to fraction form
   12,290.72/18,434.51 = 3,969.87/x
3. Step 3: Cross multiply
   12,290.72x = 18,434.51 × 3,969.87
4. Step 4: Simplify right side
   12,290.72x = 73,182,588.36
5. Step 5: Solve for x
   x = 73,182,588.36/12,290.72
6. Step 6: Final answer
   x = 5,954.30