Finding the Fourth Proportional to 1,443.57, 1,992.45 and 919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.57 : 1,992.45 = 919.50 : x
2. Step 2: Convert to fraction form
   1,443.57/1,992.45 = 919.50/x
3. Step 3: Cross multiply
   1,443.57x = 1,992.45 × 919.50
4. Step 4: Simplify right side
   1,443.57x = 1,832,057.78
5. Step 5: Solve for x
   x = 1,832,057.78/1,443.57
6. Step 6: Final answer
   x = 1,269.12