Finding the Fourth Proportional to 1,615.94, 2,229.99 and 917.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.94 : 2,229.99 = 917.31 : x
2. Step 2: Convert to fraction form
   1,615.94/2,229.99 = 917.31/x
3. Step 3: Cross multiply
   1,615.94x = 2,229.99 × 917.31
4. Step 4: Simplify right side
   1,615.94x = 2,045,591.27
5. Step 5: Solve for x
   x = 2,045,591.27/1,615.94
6. Step 6: Final answer
   x = 1,265.89