Finding the Fourth Proportional to 12,288.16, 18,429.52 and 3,521.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.16 : 18,429.52 = 3,521.12 : x
2. Step 2: Convert to fraction form
   12,288.16/18,429.52 = 3,521.12/x
3. Step 3: Cross multiply
   12,288.16x = 18,429.52 × 3,521.12
4. Step 4: Simplify right side
   12,288.16x = 64,892,551.46
5. Step 5: Solve for x
   x = 64,892,551.46/12,288.16
6. Step 6: Final answer
   x = 5,280.90