Finding the Fourth Proportional to 1,153.10, 1,591.25 and 629.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.10 : 1,591.25 = 629.12 : x
2. Step 2: Convert to fraction form
   1,153.10/1,591.25 = 629.12/x
3. Step 3: Cross multiply
   1,153.10x = 1,591.25 × 629.12
4. Step 4: Simplify right side
   1,153.10x = 1,001,076.10
5. Step 5: Solve for x
   x = 1,001,076.10/1,153.10
6. Step 6: Final answer
   x = 868.16