Finding the Fourth Proportional to 1,087.27, 1,630.91 and 356.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.27 : 1,630.91 = 356.91 : x
2. Step 2: Convert to fraction form
   1,087.27/1,630.91 = 356.91/x
3. Step 3: Cross multiply
   1,087.27x = 1,630.91 × 356.91
4. Step 4: Simplify right side
   1,087.27x = 582,081.86
5. Step 5: Solve for x
   x = 582,081.86/1,087.27
6. Step 6: Final answer
   x = 535.36