Finding the Fourth Proportional to 11,814.72, 17,717.67 and 3,915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,814.72 : 17,717.67 = 3,915.78 : x
2. Step 2: Convert to fraction form
   11,814.72/17,717.67 = 3,915.78/x
3. Step 3: Cross multiply
   11,814.72x = 17,717.67 × 3,915.78
4. Step 4: Simplify right side
   11,814.72x = 69,378,497.83
5. Step 5: Solve for x
   x = 69,378,497.83/11,814.72
6. Step 6: Final answer
   x = 5,872.21