Finding the Fourth Proportional to 2,870.57, 3,959.62 and 1,900.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.57 : 3,959.62 = 1,900.42 : x
2. Step 2: Convert to fraction form
   2,870.57/3,959.62 = 1,900.42/x
3. Step 3: Cross multiply
   2,870.57x = 3,959.62 × 1,900.42
4. Step 4: Simplify right side
   2,870.57x = 7,524,926.39
5. Step 5: Solve for x
   x = 7,524,926.39/2,870.57
6. Step 6: Final answer
   x = 2,621.40