Finding the Fourth Proportional to 16,660.76, 24,978.80 and 10,085.39

Step by Step Solution

1. Step 1: Write the proportion equation
   16,660.76 : 24,978.80 = 10,085.39 : x
2. Step 2: Convert to fraction form
   16,660.76/24,978.80 = 10,085.39/x
3. Step 3: Cross multiply
   16,660.76x = 24,978.80 × 10,085.39
4. Step 4: Simplify right side
   16,660.76x = 251,920,889.31
5. Step 5: Solve for x
   x = 251,920,889.31/16,660.76
6. Step 6: Final answer
   x = 15,120.61