Finding the Fourth Proportional to 1,153.55, 1,591.91 and 629.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.55 : 1,591.91 = 629.58 : x
2. Step 2: Convert to fraction form
   1,153.55/1,591.91 = 629.58/x
3. Step 3: Cross multiply
   1,153.55x = 1,591.91 × 629.58
4. Step 4: Simplify right side
   1,153.55x = 1,002,231.55
5. Step 5: Solve for x
   x = 1,002,231.55/1,153.55
6. Step 6: Final answer
   x = 868.83