Finding the Fourth Proportional to 16,660.51, 24,978.45 and 7,885.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,660.51 : 24,978.45 = 7,885.15 : x
2. Step 2: Convert to fraction form
   16,660.51/24,978.45 = 7,885.15/x
3. Step 3: Cross multiply
   16,660.51x = 24,978.45 × 7,885.15
4. Step 4: Simplify right side
   16,660.51x = 196,958,825.02
5. Step 5: Solve for x
   x = 196,958,825.02/16,660.51
6. Step 6: Final answer
   x = 11,821.90