Finding the Fourth Proportional to 9,621.72, 14,465.52 and 8,900.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,621.72 : 14,465.52 = 8,900.28 : x
2. Step 2: Convert to fraction form
   9,621.72/14,465.52 = 8,900.28/x
3. Step 3: Cross multiply
   9,621.72x = 14,465.52 × 8,900.28
4. Step 4: Simplify right side
   9,621.72x = 128,747,178.35
5. Step 5: Solve for x
   x = 128,747,178.35/9,621.72
6. Step 6: Final answer
   x = 13,380.89