Finding the Fourth Proportional to 11,859.57, 17,790.12 and 3,426.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,859.57 : 17,790.12 = 3,426.30 : x
2. Step 2: Convert to fraction form
   11,859.57/17,790.12 = 3,426.30/x
3. Step 3: Cross multiply
   11,859.57x = 17,790.12 × 3,426.30
4. Step 4: Simplify right side
   11,859.57x = 60,954,288.16
5. Step 5: Solve for x
   x = 60,954,288.16/11,859.57
6. Step 6: Final answer
   x = 5,139.67