Finding the Fourth Proportional to 1,196.20, 1,650.80 and 672.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.20 : 1,650.80 = 672.28 : x
2. Step 2: Convert to fraction form
   1,196.20/1,650.80 = 672.28/x
3. Step 3: Cross multiply
   1,196.20x = 1,650.80 × 672.28
4. Step 4: Simplify right side
   1,196.20x = 1,109,799.82
5. Step 5: Solve for x
   x = 1,109,799.82/1,196.20
6. Step 6: Final answer
   x = 927.77