Finding the Fourth Proportional to 1,142.10, 1,574.37 and 984.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.10 : 1,574.37 = 984.15 : x
2. Step 2: Convert to fraction form
   1,142.10/1,574.37 = 984.15/x
3. Step 3: Cross multiply
   1,142.10x = 1,574.37 × 984.15
4. Step 4: Simplify right side
   1,142.10x = 1,549,416.24
5. Step 5: Solve for x
   x = 1,549,416.24/1,142.10
6. Step 6: Final answer
   x = 1,356.64