Finding the Fourth Proportional to 1,078.88, 1,487.90 and 680.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.88 : 1,487.90 = 680.09 : x
2. Step 2: Convert to fraction form
   1,078.88/1,487.90 = 680.09/x
3. Step 3: Cross multiply
   1,078.88x = 1,487.90 × 680.09
4. Step 4: Simplify right side
   1,078.88x = 1,011,900.17
5. Step 5: Solve for x
   x = 1,011,900.17/1,078.88
6. Step 6: Final answer
   x = 937.92