Finding the Fourth Proportional to 2,807.31, 3,871.76 and 2,107.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807.31 : 3,871.76 = 2,107.47 : x
2. Step 2: Convert to fraction form
   2,807.31/3,871.76 = 2,107.47/x
3. Step 3: Cross multiply
   2,807.31x = 3,871.76 × 2,107.47
4. Step 4: Simplify right side
   2,807.31x = 8,159,607.51
5. Step 5: Solve for x
   x = 8,159,607.51/2,807.31
6. Step 6: Final answer
   x = 2,906.56