Finding the Fourth Proportional to 978.76, 1,350.42 and 605.56

Step by Step Solution

1. Step 1: Write the proportion equation
   978.76 : 1,350.42 = 605.56 : x
2. Step 2: Convert to fraction form
   978.76/1,350.42 = 605.56/x
3. Step 3: Cross multiply
   978.76x = 1,350.42 × 605.56
4. Step 4: Simplify right side
   978.76x = 817,760.34
5. Step 5: Solve for x
   x = 817,760.34/978.76
6. Step 6: Final answer
   x = 835.51