Finding the Fourth Proportional to 28,255.91, 42,387.98 and 8,536.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,255.91 : 42,387.98 = 8,536.05 : x
2. Step 2: Convert to fraction form
   28,255.91/42,387.98 = 8,536.05/x
3. Step 3: Cross multiply
   28,255.91x = 42,387.98 × 8,536.05
4. Step 4: Simplify right side
   28,255.91x = 361,825,874.00
5. Step 5: Solve for x
   x = 361,825,874.00/28,255.91
6. Step 6: Final answer
   x = 12,805.32