Finding the Fourth Proportional to 2,188.16, 3,283.37 and 871.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.16 : 3,283.37 = 871.63 : x
2. Step 2: Convert to fraction form
   2,188.16/3,283.37 = 871.63/x
3. Step 3: Cross multiply
   2,188.16x = 3,283.37 × 871.63
4. Step 4: Simplify right side
   2,188.16x = 2,861,863.02
5. Step 5: Solve for x
   x = 2,861,863.02/2,188.16
6. Step 6: Final answer
   x = 1,307.89