Finding the Fourth Proportional to 28,216.63, 42,321.57 and 8,495.29

Step by Step Solution

1. Step 1: Write the proportion equation
   28,216.63 : 42,321.57 = 8,495.29 : x
2. Step 2: Convert to fraction form
   28,216.63/42,321.57 = 8,495.29/x
3. Step 3: Cross multiply
   28,216.63x = 42,321.57 × 8,495.29
4. Step 4: Simplify right side
   28,216.63x = 359,534,010.41
5. Step 5: Solve for x
   x = 359,534,010.41/28,216.63
6. Step 6: Final answer
   x = 12,741.92