Finding the Fourth Proportional to 1,143.50, 1,575.71 and 789.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.50 : 1,575.71 = 789.53 : x
2. Step 2: Convert to fraction form
   1,143.50/1,575.71 = 789.53/x
3. Step 3: Cross multiply
   1,143.50x = 1,575.71 × 789.53
4. Step 4: Simplify right side
   1,143.50x = 1,244,070.31
5. Step 5: Solve for x
   x = 1,244,070.31/1,143.50
6. Step 6: Final answer
   x = 1,087.95