Finding the Fourth Proportional to 14,419.79, 19,899.56 and 8,453.15

Step by Step Solution

1. Step 1: Write the proportion equation
   14,419.79 : 19,899.56 = 8,453.15 : x
2. Step 2: Convert to fraction form
   14,419.79/19,899.56 = 8,453.15/x
3. Step 3: Cross multiply
   14,419.79x = 19,899.56 × 8,453.15
4. Step 4: Simplify right side
   14,419.79x = 168,213,965.61
5. Step 5: Solve for x
   x = 168,213,965.61/14,419.79
6. Step 6: Final answer
   x = 11,665.49