Finding the Fourth Proportional to 1,087.76, 1,631.69 and 357.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.76 : 1,631.69 = 357.32 : x
2. Step 2: Convert to fraction form
   1,087.76/1,631.69 = 357.32/x
3. Step 3: Cross multiply
   1,087.76x = 1,631.69 × 357.32
4. Step 4: Simplify right side
   1,087.76x = 583,025.53
5. Step 5: Solve for x
   x = 583,025.53/1,087.76
6. Step 6: Final answer
   x = 535.99