Finding the Fourth Proportional to 978.79, 1,350.71 and 605.67

Step by Step Solution

1. Step 1: Write the proportion equation
   978.79 : 1,350.71 = 605.67 : x
2. Step 2: Convert to fraction form
   978.79/1,350.71 = 605.67/x
3. Step 3: Cross multiply
   978.79x = 1,350.71 × 605.67
4. Step 4: Simplify right side
   978.79x = 818,084.53
5. Step 5: Solve for x
   x = 818,084.53/978.79
6. Step 6: Final answer
   x = 835.81