Finding the Fourth Proportional to 11,970.81, 17,958.47 and 3,651.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,970.81 : 17,958.47 = 3,651.57 : x
2. Step 2: Convert to fraction form
   11,970.81/17,958.47 = 3,651.57/x
3. Step 3: Cross multiply
   11,970.81x = 17,958.47 × 3,651.57
4. Step 4: Simplify right side
   11,970.81x = 65,576,592.04
5. Step 5: Solve for x
   x = 65,576,592.04/11,970.81
6. Step 6: Final answer
   x = 5,478.04