Finding the Fourth Proportional to 978.78, 1,350.73 and 536.73

Step by Step Solution

1. Step 1: Write the proportion equation
   978.78 : 1,350.73 = 536.73 : x
2. Step 2: Convert to fraction form
   978.78/1,350.73 = 536.73/x
3. Step 3: Cross multiply
   978.78x = 1,350.73 × 536.73
4. Step 4: Simplify right side
   978.78x = 724,969.90
5. Step 5: Solve for x
   x = 724,969.90/978.78
6. Step 6: Final answer
   x = 740.68