Finding the Fourth Proportional to 2,128.87, 2,935.42 and 1,499.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.87 : 2,935.42 = 1,499.20 : x
2. Step 2: Convert to fraction form
   2,128.87/2,935.42 = 1,499.20/x
3. Step 3: Cross multiply
   2,128.87x = 2,935.42 × 1,499.20
4. Step 4: Simplify right side
   2,128.87x = 4,400,766.99
5. Step 5: Solve for x
   x = 4,400,766.99/2,128.87
6. Step 6: Final answer
   x = 2,067.18