Finding the Fourth Proportional to 1,113.06, 1,536.06 and 615.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.06 : 1,536.06 = 615.72 : x
2. Step 2: Convert to fraction form
   1,113.06/1,536.06 = 615.72/x
3. Step 3: Cross multiply
   1,113.06x = 1,536.06 × 615.72
4. Step 4: Simplify right side
   1,113.06x = 945,782.86
5. Step 5: Solve for x
   x = 945,782.86/1,113.06
6. Step 6: Final answer
   x = 849.71