Finding the Fourth Proportional to 2,861.37, 3,947.27 and 1,811.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.37 : 3,947.27 = 1,811.61 : x
2. Step 2: Convert to fraction form
   2,861.37/3,947.27 = 1,811.61/x
3. Step 3: Cross multiply
   2,861.37x = 3,947.27 × 1,811.61
4. Step 4: Simplify right side
   2,861.37x = 7,150,904.75
5. Step 5: Solve for x
   x = 7,150,904.75/2,861.37
6. Step 6: Final answer
   x = 2,499.12