Finding the Fourth Proportional to 2,851.31, 3,932.87 and 1,906.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.31 : 3,932.87 = 1,906.71 : x
2. Step 2: Convert to fraction form
   2,851.31/3,932.87 = 1,906.71/x
3. Step 3: Cross multiply
   2,851.31x = 3,932.87 × 1,906.71
4. Step 4: Simplify right side
   2,851.31x = 7,498,833.02
5. Step 5: Solve for x
   x = 7,498,833.02/2,851.31
6. Step 6: Final answer
   x = 2,629.97