Finding the Fourth Proportional to 7,086.72, 10,631.52 and 3,971.16

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.72 : 10,631.52 = 3,971.16 : x
2. Step 2: Convert to fraction form
   7,086.72/10,631.52 = 3,971.16/x
3. Step 3: Cross multiply
   7,086.72x = 10,631.52 × 3,971.16
4. Step 4: Simplify right side
   7,086.72x = 42,219,466.96
5. Step 5: Solve for x
   x = 42,219,466.96/7,086.72
6. Step 6: Final answer
   x = 5,957.55