Finding the Fourth Proportional to 1,113.50, 1,536.72 and 616.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.50 : 1,536.72 = 616.30 : x
2. Step 2: Convert to fraction form
   1,113.50/1,536.72 = 616.30/x
3. Step 3: Cross multiply
   1,113.50x = 1,536.72 × 616.30
4. Step 4: Simplify right side
   1,113.50x = 947,085.35
5. Step 5: Solve for x
   x = 947,085.35/1,113.50
6. Step 6: Final answer
   x = 850.55