Finding the Fourth Proportional to 1,434.21, 1,979.18 and 804.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.21 : 1,979.18 = 804.69 : x
2. Step 2: Convert to fraction form
   1,434.21/1,979.18 = 804.69/x
3. Step 3: Cross multiply
   1,434.21x = 1,979.18 × 804.69
4. Step 4: Simplify right side
   1,434.21x = 1,592,622.33
5. Step 5: Solve for x
   x = 1,592,622.33/1,434.21
6. Step 6: Final answer
   x = 1,110.45