Finding the Fourth Proportional to 28,362.72, 42,479.28 and 13,582.02

Step by Step Solution

1. Step 1: Write the proportion equation
   28,362.72 : 42,479.28 = 13,582.02 : x
2. Step 2: Convert to fraction form
   28,362.72/42,479.28 = 13,582.02/x
3. Step 3: Cross multiply
   28,362.72x = 42,479.28 × 13,582.02
4. Step 4: Simplify right side
   28,362.72x = 576,954,430.55
5. Step 5: Solve for x
   x = 576,954,430.55/28,362.72
6. Step 6: Final answer
   x = 20,342.00