Finding the Fourth Proportional to 978.70, 1,350.61 and 536.59

Step by Step Solution

1. Step 1: Write the proportion equation
   978.70 : 1,350.61 = 536.59 : x
2. Step 2: Convert to fraction form
   978.70/1,350.61 = 536.59/x
3. Step 3: Cross multiply
   978.70x = 1,350.61 × 536.59
4. Step 4: Simplify right side
   978.70x = 724,723.82
5. Step 5: Solve for x
   x = 724,723.82/978.70
6. Step 6: Final answer
   x = 740.50