Finding the Fourth Proportional to 1,434.20, 1,979.28 and 804.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.20 : 1,979.28 = 804.78 : x
2. Step 2: Convert to fraction form
   1,434.20/1,979.28 = 804.78/x
3. Step 3: Cross multiply
   1,434.20x = 1,979.28 × 804.78
4. Step 4: Simplify right side
   1,434.20x = 1,592,884.96
5. Step 5: Solve for x
   x = 1,592,884.96/1,434.20
6. Step 6: Final answer
   x = 1,110.65