Finding the Fourth Proportional to 1,078.02, 1,487.43 and 685.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.02 : 1,487.43 = 685.62 : x
2. Step 2: Convert to fraction form
   1,078.02/1,487.43 = 685.62/x
3. Step 3: Cross multiply
   1,078.02x = 1,487.43 × 685.62
4. Step 4: Simplify right side
   1,078.02x = 1,019,811.76
5. Step 5: Solve for x
   x = 1,019,811.76/1,078.02
6. Step 6: Final answer
   x = 946.00