Finding the Fourth Proportional to 1,434.78, 1,980.09 and 845.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.78 : 1,980.09 = 845.37 : x
2. Step 2: Convert to fraction form
   1,434.78/1,980.09 = 845.37/x
3. Step 3: Cross multiply
   1,434.78x = 1,980.09 × 845.37
4. Step 4: Simplify right side
   1,434.78x = 1,673,908.68
5. Step 5: Solve for x
   x = 1,673,908.68/1,434.78
6. Step 6: Final answer
   x = 1,166.67