Finding the Fourth Proportional to 14,571.30, 21,856.71 and 5,208.78

Step by Step Solution

1. Step 1: Write the proportion equation
   14,571.30 : 21,856.71 = 5,208.78 : x
2. Step 2: Convert to fraction form
   14,571.30/21,856.71 = 5,208.78/x
3. Step 3: Cross multiply
   14,571.30x = 21,856.71 × 5,208.78
4. Step 4: Simplify right side
   14,571.30x = 113,846,793.91
5. Step 5: Solve for x
   x = 113,846,793.91/14,571.30
6. Step 6: Final answer
   x = 7,813.08