Finding the Fourth Proportional to 1,408.32, 1,941.20 and 1,128.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.32 : 1,941.20 = 1,128.13 : x
2. Step 2: Convert to fraction form
   1,408.32/1,941.20 = 1,128.13/x
3. Step 3: Cross multiply
   1,408.32x = 1,941.20 × 1,128.13
4. Step 4: Simplify right side
   1,408.32x = 2,189,919.69
5. Step 5: Solve for x
   x = 2,189,919.69/1,408.32
6. Step 6: Final answer
   x = 1,554.99