Finding the Fourth Proportional to 3,488.91, 4,815.32 and 2,091.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,488.91 : 4,815.32 = 2,091.87 : x
2. Step 2: Convert to fraction form
   3,488.91/4,815.32 = 2,091.87/x
3. Step 3: Cross multiply
   3,488.91x = 4,815.32 × 2,091.87
4. Step 4: Simplify right side
   3,488.91x = 10,073,023.45
5. Step 5: Solve for x
   x = 10,073,023.45/3,488.91
6. Step 6: Final answer
   x = 2,887.15