Finding the Fourth Proportional to 1,131.89, 1,561.14 and 974.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.89 : 1,561.14 = 974.78 : x
2. Step 2: Convert to fraction form
   1,131.89/1,561.14 = 974.78/x
3. Step 3: Cross multiply
   1,131.89x = 1,561.14 × 974.78
4. Step 4: Simplify right side
   1,131.89x = 1,521,760.24
5. Step 5: Solve for x
   x = 1,521,760.24/1,131.89
6. Step 6: Final answer
   x = 1,344.45