Finding the Fourth Proportional to 3,685.79, 5,086.23 and 2,007.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.79 : 5,086.23 = 2,007.20 : x
2. Step 2: Convert to fraction form
   3,685.79/5,086.23 = 2,007.20/x
3. Step 3: Cross multiply
   3,685.79x = 5,086.23 × 2,007.20
4. Step 4: Simplify right side
   3,685.79x = 10,209,080.86
5. Step 5: Solve for x
   x = 10,209,080.86/3,685.79
6. Step 6: Final answer
   x = 2,769.85