Finding the Fourth Proportional to 11,815.58, 17,724.24 and 3,917.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,815.58 : 17,724.24 = 3,917.78 : x
2. Step 2: Convert to fraction form
   11,815.58/17,724.24 = 3,917.78/x
3. Step 3: Cross multiply
   11,815.58x = 17,724.24 × 3,917.78
4. Step 4: Simplify right side
   11,815.58x = 69,439,650.83
5. Step 5: Solve for x
   x = 69,439,650.83/11,815.58
6. Step 6: Final answer
   x = 5,876.96