Finding the Fourth Proportional to 1,153.89, 1,591.79 and 874.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,153.89 : 1,591.79 = 874.17 : x
2. Step 2: Convert to fraction form
   1,153.89/1,591.79 = 874.17/x
3. Step 3: Cross multiply
   1,153.89x = 1,591.79 × 874.17
4. Step 4: Simplify right side
   1,153.89x = 1,391,490.69
5. Step 5: Solve for x
   x = 1,391,490.69/1,153.89
6. Step 6: Final answer
   x = 1,205.91