Finding the Fourth Proportional to 1,947.08, 2,688.72 and 1,811

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.08 : 2,688.72 = 1,811 : x
2. Step 2: Convert to fraction form
   1,947.08/2,688.72 = 1,811/x
3. Step 3: Cross multiply
   1,947.08x = 2,688.72 × 1,811
4. Step 4: Simplify right side
   1,947.08x = 4,869,271.92
5. Step 5: Solve for x
   x = 4,869,271.92/1,947.08
6. Step 6: Final answer
   x = 2,500.81