Finding the Fourth Proportional to 10,521.58, 15,743.39 and 8,435.27

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.58 : 15,743.39 = 8,435.27 : x
2. Step 2: Convert to fraction form
   10,521.58/15,743.39 = 8,435.27/x
3. Step 3: Cross multiply
   10,521.58x = 15,743.39 × 8,435.27
4. Step 4: Simplify right side
   10,521.58x = 132,799,766.27
5. Step 5: Solve for x
   x = 132,799,766.27/10,521.58
6. Step 6: Final answer
   x = 12,621.66