Finding the Fourth Proportional to 1,288.30, 1,934.82 and 672.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.30 : 1,934.82 = 672.42 : x
2. Step 2: Convert to fraction form
   1,288.30/1,934.82 = 672.42/x
3. Step 3: Cross multiply
   1,288.30x = 1,934.82 × 672.42
4. Step 4: Simplify right side
   1,288.30x = 1,301,011.66
5. Step 5: Solve for x
   x = 1,301,011.66/1,288.30
6. Step 6: Final answer
   x = 1,009.87