Finding the Fourth Proportional to 12,153.28, 16,779.27 and 9,920.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,153.28 : 16,779.27 = 9,920.46 : x
2. Step 2: Convert to fraction form
   12,153.28/16,779.27 = 9,920.46/x
3. Step 3: Cross multiply
   12,153.28x = 16,779.27 × 9,920.46
4. Step 4: Simplify right side
   12,153.28x = 166,458,076.86
5. Step 5: Solve for x
   x = 166,458,076.86/12,153.28
6. Step 6: Final answer
   x = 13,696.56