Finding the Fourth Proportional to 1,113.40, 1,536.50 and 616.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.40 : 1,536.50 = 616.05 : x
2. Step 2: Convert to fraction form
   1,113.40/1,536.50 = 616.05/x
3. Step 3: Cross multiply
   1,113.40x = 1,536.50 × 616.05
4. Step 4: Simplify right side
   1,113.40x = 946,552.42
5. Step 5: Solve for x
   x = 946,552.42/1,113.40
6. Step 6: Final answer
   x = 850.15