Finding the Fourth Proportional to 1,871.31, 2,808.20 and 717.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.31 : 2,808.20 = 717.06 : x
2. Step 2: Convert to fraction form
   1,871.31/2,808.20 = 717.06/x
3. Step 3: Cross multiply
   1,871.31x = 2,808.20 × 717.06
4. Step 4: Simplify right side
   1,871.31x = 2,013,647.89
5. Step 5: Solve for x
   x = 2,013,647.89/1,871.31
6. Step 6: Final answer
   x = 1,076.06