Finding the Fourth Proportional to 2,057.56, 3,087.70 and 1,920.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.56 : 3,087.70 = 1,920.87 : x
2. Step 2: Convert to fraction form
   2,057.56/3,087.70 = 1,920.87/x
3. Step 3: Cross multiply
   2,057.56x = 3,087.70 × 1,920.87
4. Step 4: Simplify right side
   2,057.56x = 5,931,065.50
5. Step 5: Solve for x
   x = 5,931,065.50/2,057.56
6. Step 6: Final answer
   x = 2,882.58