Finding the Fourth Proportional to 2,961.91, 4,086.89 and 1,899.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,961.91 : 4,086.89 = 1,899.87 : x
2. Step 2: Convert to fraction form
   2,961.91/4,086.89 = 1,899.87/x
3. Step 3: Cross multiply
   2,961.91x = 4,086.89 × 1,899.87
4. Step 4: Simplify right side
   2,961.91x = 7,764,559.70
5. Step 5: Solve for x
   x = 7,764,559.70/2,961.91
6. Step 6: Final answer
   x = 2,621.47