Finding the Fourth Proportional to 1,443.52, 1,991.76 and 919.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.52 : 1,991.76 = 919.36 : x
2. Step 2: Convert to fraction form
   1,443.52/1,991.76 = 919.36/x
3. Step 3: Cross multiply
   1,443.52x = 1,991.76 × 919.36
4. Step 4: Simplify right side
   1,443.52x = 1,831,144.47
5. Step 5: Solve for x
   x = 1,831,144.47/1,443.52
6. Step 6: Final answer
   x = 1,268.53