Finding the Fourth Proportional to 28,256.25, 42,391.94 and 9,788.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,256.25 : 42,391.94 = 9,788.25 : x
2. Step 2: Convert to fraction form
   28,256.25/42,391.94 = 9,788.25/x
3. Step 3: Cross multiply
   28,256.25x = 42,391.94 × 9,788.25
4. Step 4: Simplify right side
   28,256.25x = 414,942,857.76
5. Step 5: Solve for x
   x = 414,942,857.76/28,256.25
6. Step 6: Final answer
   x = 14,684.99