Finding the Fourth Proportional to 1,443.56, 1,991.12 and 919.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.56 : 1,991.12 = 919.35 : x
2. Step 2: Convert to fraction form
   1,443.56/1,991.12 = 919.35/x
3. Step 3: Cross multiply
   1,443.56x = 1,991.12 × 919.35
4. Step 4: Simplify right side
   1,443.56x = 1,830,531.58
5. Step 5: Solve for x
   x = 1,830,531.58/1,443.56
6. Step 6: Final answer
   x = 1,268.07