Finding the Fourth Proportional to 11,906.91, 17,859.65 and 3,586.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,906.91 : 17,859.65 = 3,586.72 : x
2. Step 2: Convert to fraction form
   11,906.91/17,859.65 = 3,586.72/x
3. Step 3: Cross multiply
   11,906.91x = 17,859.65 × 3,586.72
4. Step 4: Simplify right side
   11,906.91x = 64,057,563.85
5. Step 5: Solve for x
   x = 64,057,563.85/11,906.91
6. Step 6: Final answer
   x = 5,379.86