Finding the Fourth Proportional to 1,615.59, 2,229.21 and 916.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.59 : 2,229.21 = 916.83 : x
2. Step 2: Convert to fraction form
   1,615.59/2,229.21 = 916.83/x
3. Step 3: Cross multiply
   1,615.59x = 2,229.21 × 916.83
4. Step 4: Simplify right side
   1,615.59x = 2,043,806.60
5. Step 5: Solve for x
   x = 2,043,806.60/1,615.59
6. Step 6: Final answer
   x = 1,265.05