Finding the Fourth Proportional to 12,816, 19,224.72 and 3,582.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816 : 19,224.72 = 3,582.72 : x
2. Step 2: Convert to fraction form
   12,816/19,224.72 = 3,582.72/x
3. Step 3: Cross multiply
   12,816x = 19,224.72 × 3,582.72
4. Step 4: Simplify right side
   12,816x = 68,876,788.84
5. Step 5: Solve for x
   x = 68,876,788.84/12,816
6. Step 6: Final answer
   x = 5,374.28