Finding the Fourth Proportional to 1,434.78, 1,979.94 and 936.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.78 : 1,979.94 = 936.48 : x
2. Step 2: Convert to fraction form
   1,434.78/1,979.94 = 936.48/x
3. Step 3: Cross multiply
   1,434.78x = 1,979.94 × 936.48
4. Step 4: Simplify right side
   1,434.78x = 1,854,174.21
5. Step 5: Solve for x
   x = 1,854,174.21/1,434.78
6. Step 6: Final answer
   x = 1,292.31