Finding the Fourth Proportional to 11,410.78, 17,117.61 and 3,915.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,410.78 : 17,117.61 = 3,915.80 : x
2. Step 2: Convert to fraction form
   11,410.78/17,117.61 = 3,915.80/x
3. Step 3: Cross multiply
   11,410.78x = 17,117.61 × 3,915.80
4. Step 4: Simplify right side
   11,410.78x = 67,029,182.34
5. Step 5: Solve for x
   x = 67,029,182.34/11,410.78
6. Step 6: Final answer
   x = 5,874.20