Finding the Fourth Proportional to 1,399.32, 1,928.43 and 1,149.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.32 : 1,928.43 = 1,149.12 : x
2. Step 2: Convert to fraction form
   1,399.32/1,928.43 = 1,149.12/x
3. Step 3: Cross multiply
   1,399.32x = 1,928.43 × 1,149.12
4. Step 4: Simplify right side
   1,399.32x = 2,215,997.48
5. Step 5: Solve for x
   x = 2,215,997.48/1,399.32
6. Step 6: Final answer
   x = 1,583.62