Finding the Fourth Proportional to 3,809.61, 5,716.50 and 1,861.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,809.61 : 5,716.50 = 1,861.83 : x
2. Step 2: Convert to fraction form
   3,809.61/5,716.50 = 1,861.83/x
3. Step 3: Cross multiply
   3,809.61x = 5,716.50 × 1,861.83
4. Step 4: Simplify right side
   3,809.61x = 10,643,151.20
5. Step 5: Solve for x
   x = 10,643,151.20/3,809.61
6. Step 6: Final answer
   x = 2,793.76