Finding the Fourth Proportional to 1,072.15, 1,479.50 and 679.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.15 : 1,479.50 = 679.30 : x
2. Step 2: Convert to fraction form
   1,072.15/1,479.50 = 679.30/x
3. Step 3: Cross multiply
   1,072.15x = 1,479.50 × 679.30
4. Step 4: Simplify right side
   1,072.15x = 1,005,019.80
5. Step 5: Solve for x
   x = 1,005,019.80/1,072.15
6. Step 6: Final answer
   x = 937.39