Finding the Fourth Proportional to 1,153.12, 1,591.31 and 629.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.12 : 1,591.31 = 629.15 : x
2. Step 2: Convert to fraction form
   1,153.12/1,591.31 = 629.15/x
3. Step 3: Cross multiply
   1,153.12x = 1,591.31 × 629.15
4. Step 4: Simplify right side
   1,153.12x = 1,001,172.69
5. Step 5: Solve for x
   x = 1,001,172.69/1,153.12
6. Step 6: Final answer
   x = 868.23