Finding the Fourth Proportional to 1,113.08, 1,536.04 and 615.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.08 : 1,536.04 = 615.72 : x
2. Step 2: Convert to fraction form
   1,113.08/1,536.04 = 615.72/x
3. Step 3: Cross multiply
   1,113.08x = 1,536.04 × 615.72
4. Step 4: Simplify right side
   1,113.08x = 945,770.55
5. Step 5: Solve for x
   x = 945,770.55/1,113.08
6. Step 6: Final answer
   x = 849.69