Finding the Fourth Proportional to 1,433.94, 1,979.16 and 909.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.94 : 1,979.16 = 909.88 : x
2. Step 2: Convert to fraction form
   1,433.94/1,979.16 = 909.88/x
3. Step 3: Cross multiply
   1,433.94x = 1,979.16 × 909.88
4. Step 4: Simplify right side
   1,433.94x = 1,800,798.10
5. Step 5: Solve for x
   x = 1,800,798.10/1,433.94
6. Step 6: Final answer
   x = 1,255.84