Finding the Fourth Proportional to 1,078.54, 1,487.94 and 680.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.54 : 1,487.94 = 680.06 : x
2. Step 2: Convert to fraction form
   1,078.54/1,487.94 = 680.06/x
3. Step 3: Cross multiply
   1,078.54x = 1,487.94 × 680.06
4. Step 4: Simplify right side
   1,078.54x = 1,011,898.52
5. Step 5: Solve for x
   x = 1,011,898.52/1,078.54
6. Step 6: Final answer
   x = 938.21