Finding the Fourth Proportional to 1,418.18, 2,126.72 and 724.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.18 : 2,126.72 = 724.60 : x
2. Step 2: Convert to fraction form
   1,418.18/2,126.72 = 724.60/x
3. Step 3: Cross multiply
   1,418.18x = 2,126.72 × 724.60
4. Step 4: Simplify right side
   1,418.18x = 1,541,021.31
5. Step 5: Solve for x
   x = 1,541,021.31/1,418.18
6. Step 6: Final answer
   x = 1,086.62