Finding the Fourth Proportional to 1,116.55, 1,672.38 and 727.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.55 : 1,672.38 = 727.12 : x
2. Step 2: Convert to fraction form
   1,116.55/1,672.38 = 727.12/x
3. Step 3: Cross multiply
   1,116.55x = 1,672.38 × 727.12
4. Step 4: Simplify right side
   1,116.55x = 1,216,020.95
5. Step 5: Solve for x
   x = 1,216,020.95/1,116.55
6. Step 6: Final answer
   x = 1,089.09