Finding the Fourth Proportional to 11,117.61, 16,665.46 and 5,278.32

Step by Step Solution

1. Step 1: Write the proportion equation
   11,117.61 : 16,665.46 = 5,278.32 : x
2. Step 2: Convert to fraction form
   11,117.61/16,665.46 = 5,278.32/x
3. Step 3: Cross multiply
   11,117.61x = 16,665.46 × 5,278.32
4. Step 4: Simplify right side
   11,117.61x = 87,965,630.83
5. Step 5: Solve for x
   x = 87,965,630.83/11,117.61
6. Step 6: Final answer
   x = 7,912.28