Finding the Fourth Proportional to 7,086.72, 10,631.76 and 2,156.64

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.72 : 10,631.76 = 2,156.64 : x
2. Step 2: Convert to fraction form
   7,086.72/10,631.76 = 2,156.64/x
3. Step 3: Cross multiply
   7,086.72x = 10,631.76 × 2,156.64
4. Step 4: Simplify right side
   7,086.72x = 22,928,878.89
5. Step 5: Solve for x
   x = 22,928,878.89/7,086.72
6. Step 6: Final answer
   x = 3,235.47