Finding the Fourth Proportional to 7,215.71, 9,957.71 and 4,231.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,215.71 : 9,957.71 = 4,231.60 : x
2. Step 2: Convert to fraction form
   7,215.71/9,957.71 = 4,231.60/x
3. Step 3: Cross multiply
   7,215.71x = 9,957.71 × 4,231.60
4. Step 4: Simplify right side
   7,215.71x = 42,137,031.32
5. Step 5: Solve for x
   x = 42,137,031.32/7,215.71
6. Step 6: Final answer
   x = 5,839.63