Finding the Fourth Proportional to 4,086.76, 5,639.72 and 2,318.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,086.76 : 5,639.72 = 2,318.72 : x
2. Step 2: Convert to fraction form
   4,086.76/5,639.72 = 2,318.72/x
3. Step 3: Cross multiply
   4,086.76x = 5,639.72 × 2,318.72
4. Step 4: Simplify right side
   4,086.76x = 13,076,931.56
5. Step 5: Solve for x
   x = 13,076,931.56/4,086.76
6. Step 6: Final answer
   x = 3,199.83