Finding the Fourth Proportional to 1,443.85, 1,990.69 and 945.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.85 : 1,990.69 = 945.70 : x
2. Step 2: Convert to fraction form
   1,443.85/1,990.69 = 945.70/x
3. Step 3: Cross multiply
   1,443.85x = 1,990.69 × 945.70
4. Step 4: Simplify right side
   1,443.85x = 1,882,588.19
5. Step 5: Solve for x
   x = 1,882,588.19/1,443.85
6. Step 6: Final answer
   x = 1,303.87