Finding the Fourth Proportional to 1,072.50, 1,479.78 and 679.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.50 : 1,479.78 = 679.56 : x
2. Step 2: Convert to fraction form
   1,072.50/1,479.78 = 679.56/x
3. Step 3: Cross multiply
   1,072.50x = 1,479.78 × 679.56
4. Step 4: Simplify right side
   1,072.50x = 1,005,599.30
5. Step 5: Solve for x
   x = 1,005,599.30/1,072.50
6. Step 6: Final answer
   x = 937.62