Finding the Fourth Proportional to 1,162.72, 1,742.52 and 613.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.72 : 1,742.52 = 613.72 : x
2. Step 2: Convert to fraction form
   1,162.72/1,742.52 = 613.72/x
3. Step 3: Cross multiply
   1,162.72x = 1,742.52 × 613.72
4. Step 4: Simplify right side
   1,162.72x = 1,069,419.37
5. Step 5: Solve for x
   x = 1,069,419.37/1,162.72
6. Step 6: Final answer
   x = 919.76