Finding the Fourth Proportional to 1,443.47, 1,990.91 and 919.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.47 : 1,990.91 = 919.67 : x
2. Step 2: Convert to fraction form
   1,443.47/1,990.91 = 919.67/x
3. Step 3: Cross multiply
   1,443.47x = 1,990.91 × 919.67
4. Step 4: Simplify right side
   1,443.47x = 1,830,972.54
5. Step 5: Solve for x
   x = 1,830,972.54/1,443.47
6. Step 6: Final answer
   x = 1,268.46