Finding the Fourth Proportional to 28,287.69, 42,431.52 and 7,227.77

Step by Step Solution

1. Step 1: Write the proportion equation
   28,287.69 : 42,431.52 = 7,227.77 : x
2. Step 2: Convert to fraction form
   28,287.69/42,431.52 = 7,227.77/x
3. Step 3: Cross multiply
   28,287.69x = 42,431.52 × 7,227.77
4. Step 4: Simplify right side
   28,287.69x = 306,685,267.31
5. Step 5: Solve for x
   x = 306,685,267.31/28,287.69
6. Step 6: Final answer
   x = 10,841.65