Finding the Fourth Proportional to 1,153.31, 1,591.61 and 629.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.31 : 1,591.61 = 629.38 : x
2. Step 2: Convert to fraction form
   1,153.31/1,591.61 = 629.38/x
3. Step 3: Cross multiply
   1,153.31x = 1,591.61 × 629.38
4. Step 4: Simplify right side
   1,153.31x = 1,001,720.38
5. Step 5: Solve for x
   x = 1,001,720.38/1,153.31
6. Step 6: Final answer
   x = 868.56