Finding the Fourth Proportional to 7,044.55, 9,721.78 and 3,900.74

Step by Step Solution

1. Step 1: Write the proportion equation
   7,044.55 : 9,721.78 = 3,900.74 : x
2. Step 2: Convert to fraction form
   7,044.55/9,721.78 = 3,900.74/x
3. Step 3: Cross multiply
   7,044.55x = 9,721.78 × 3,900.74
4. Step 4: Simplify right side
   7,044.55x = 37,922,087.51
5. Step 5: Solve for x
   x = 37,922,087.51/7,044.55
6. Step 6: Final answer
   x = 5,383.18