Finding the Fourth Proportional to 10,284.37, 14,178.71 and 7,721.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,284.37 : 14,178.71 = 7,721.28 : x
2. Step 2: Convert to fraction form
   10,284.37/14,178.71 = 7,721.28/x
3. Step 3: Cross multiply
   10,284.37x = 14,178.71 × 7,721.28
4. Step 4: Simplify right side
   10,284.37x = 109,477,789.95
5. Step 5: Solve for x
   x = 109,477,789.95/10,284.37
6. Step 6: Final answer
   x = 10,645.07