Finding the Fourth Proportional to 10,863.21, 16,306.33 and 9,621.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,863.21 : 16,306.33 = 9,621.86 : x
2. Step 2: Convert to fraction form
   10,863.21/16,306.33 = 9,621.86/x
3. Step 3: Cross multiply
   10,863.21x = 16,306.33 × 9,621.86
4. Step 4: Simplify right side
   10,863.21x = 156,897,224.37
5. Step 5: Solve for x
   x = 156,897,224.37/10,863.21
6. Step 6: Final answer
   x = 14,442.99