Finding the Fourth Proportional to 28,863.42, 43,282.17 and 13,285.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,863.42 : 43,282.17 = 13,285.50 : x
2. Step 2: Convert to fraction form
   28,863.42/43,282.17 = 13,285.50/x
3. Step 3: Cross multiply
   28,863.42x = 43,282.17 × 13,285.50
4. Step 4: Simplify right side
   28,863.42x = 575,025,269.54
5. Step 5: Solve for x
   x = 575,025,269.54/28,863.42
6. Step 6: Final answer
   x = 19,922.28