Finding the Fourth Proportional to 2,057.71, 3,087.51 and 872.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.71 : 3,087.51 = 872.08 : x
2. Step 2: Convert to fraction form
   2,057.71/3,087.51 = 872.08/x
3. Step 3: Cross multiply
   2,057.71x = 3,087.51 × 872.08
4. Step 4: Simplify right side
   2,057.71x = 2,692,546.43
5. Step 5: Solve for x
   x = 2,692,546.43/2,057.71
6. Step 6: Final answer
   x = 1,308.51