Finding the Fourth Proportional to 11,658.38, 17,490.33 and 3,867.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,658.38 : 17,490.33 = 3,867.20 : x
2. Step 2: Convert to fraction form
   11,658.38/17,490.33 = 3,867.20/x
3. Step 3: Cross multiply
   11,658.38x = 17,490.33 × 3,867.20
4. Step 4: Simplify right side
   11,658.38x = 67,638,516.72
5. Step 5: Solve for x
   x = 67,638,516.72/11,658.38
6. Step 6: Final answer
   x = 5,801.71