Finding the Fourth Proportional to 1,228.91, 1,695.89 and 731.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.91 : 1,695.89 = 731.57 : x
2. Step 2: Convert to fraction form
   1,228.91/1,695.89 = 731.57/x
3. Step 3: Cross multiply
   1,228.91x = 1,695.89 × 731.57
4. Step 4: Simplify right side
   1,228.91x = 1,240,655.60
5. Step 5: Solve for x
   x = 1,240,655.60/1,228.91
6. Step 6: Final answer
   x = 1,009.56