Finding the Fourth Proportional to 1,087.82, 1,629.42 and 503.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.82 : 1,629.42 = 503.30 : x
2. Step 2: Convert to fraction form
   1,087.82/1,629.42 = 503.30/x
3. Step 3: Cross multiply
   1,087.82x = 1,629.42 × 503.30
4. Step 4: Simplify right side
   1,087.82x = 820,078.94
5. Step 5: Solve for x
   x = 820,078.94/1,087.82
6. Step 6: Final answer
   x = 753.88