Finding the Fourth Proportional to 1,353.72, 2,028.16 and 919.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.72 : 2,028.16 = 919.32 : x
2. Step 2: Convert to fraction form
   1,353.72/2,028.16 = 919.32/x
3. Step 3: Cross multiply
   1,353.72x = 2,028.16 × 919.32
4. Step 4: Simplify right side
   1,353.72x = 1,864,528.05
5. Step 5: Solve for x
   x = 1,864,528.05/1,353.72
6. Step 6: Final answer
   x = 1,377.34