Finding the Fourth Proportional to 4,086.91, 5,639.88 and 2,318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   4,086.91 : 5,639.88 = 2,318.50 : x
2. Step 2: Convert to fraction form
   4,086.91/5,639.88 = 2,318.50/x
3. Step 3: Cross multiply
   4,086.91x = 5,639.88 × 2,318.50
4. Step 4: Simplify right side
   4,086.91x = 13,076,061.78
5. Step 5: Solve for x
   x = 13,076,061.78/4,086.91
6. Step 6: Final answer
   x = 3,199.50