Finding the Fourth Proportional to 1,434.57, 1,979.78 and 845.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.57 : 1,979.78 = 845.30 : x
2. Step 2: Convert to fraction form
   1,434.57/1,979.78 = 845.30/x
3. Step 3: Cross multiply
   1,434.57x = 1,979.78 × 845.30
4. Step 4: Simplify right side
   1,434.57x = 1,673,493.91
5. Step 5: Solve for x
   x = 1,673,493.91/1,434.57
6. Step 6: Final answer
   x = 1,166.55