Finding the Fourth Proportional to 16,638.56, 22,966.20 and 9,928.88

Step by Step Solution

1. Step 1: Write the proportion equation
   16,638.56 : 22,966.20 = 9,928.88 : x
2. Step 2: Convert to fraction form
   16,638.56/22,966.20 = 9,928.88/x
3. Step 3: Cross multiply
   16,638.56x = 22,966.20 × 9,928.88
4. Step 4: Simplify right side
   16,638.56x = 228,028,643.86
5. Step 5: Solve for x
   x = 228,028,643.86/16,638.56
6. Step 6: Final answer
   x = 13,704.83