Finding the Fourth Proportional to 1,443.84, 1,991.94 and 919.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.84 : 1,991.94 = 919.74 : x
2. Step 2: Convert to fraction form
   1,443.84/1,991.94 = 919.74/x
3. Step 3: Cross multiply
   1,443.84x = 1,991.94 × 919.74
4. Step 4: Simplify right side
   1,443.84x = 1,832,066.90
5. Step 5: Solve for x
   x = 1,832,066.90/1,443.84
6. Step 6: Final answer
   x = 1,268.88