Finding the Fourth Proportional to 1,434.69, 1,979.55 and 845.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.69 : 1,979.55 = 845.28 : x
2. Step 2: Convert to fraction form
   1,434.69/1,979.55 = 845.28/x
3. Step 3: Cross multiply
   1,434.69x = 1,979.55 × 845.28
4. Step 4: Simplify right side
   1,434.69x = 1,673,274.02
5. Step 5: Solve for x
   x = 1,673,274.02/1,434.69
6. Step 6: Final answer
   x = 1,166.30