Finding the Fourth Proportional to 1,072.28, 1,479.86 and 679.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.28 : 1,479.86 = 679.34 : x
2. Step 2: Convert to fraction form
   1,072.28/1,479.86 = 679.34/x
3. Step 3: Cross multiply
   1,072.28x = 1,479.86 × 679.34
4. Step 4: Simplify right side
   1,072.28x = 1,005,317.30
5. Step 5: Solve for x
   x = 1,005,317.30/1,072.28
6. Step 6: Final answer
   x = 937.56