Finding the Fourth Proportional to 1,434.72, 1,979.68 and 837.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.72 : 1,979.68 = 837.28 : x
2. Step 2: Convert to fraction form
   1,434.72/1,979.68 = 837.28/x
3. Step 3: Cross multiply
   1,434.72x = 1,979.68 × 837.28
4. Step 4: Simplify right side
   1,434.72x = 1,657,546.47
5. Step 5: Solve for x
   x = 1,657,546.47/1,434.72
6. Step 6: Final answer
   x = 1,155.31