Finding the Fourth Proportional to 14,716.48, 20,308.89 and 8,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,716.48 : 20,308.89 = 8,428.72 : x
2. Step 2: Convert to fraction form
   14,716.48/20,308.89 = 8,428.72/x
3. Step 3: Cross multiply
   14,716.48x = 20,308.89 × 8,428.72
4. Step 4: Simplify right side
   14,716.48x = 171,177,947.32
5. Step 5: Solve for x
   x = 171,177,947.32/14,716.48
6. Step 6: Final answer
   x = 11,631.72