Finding the Fourth Proportional to 1,418.83, 2,128.46 and 725.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.83 : 2,128.46 = 725.12 : x
2. Step 2: Convert to fraction form
   1,418.83/2,128.46 = 725.12/x
3. Step 3: Cross multiply
   1,418.83x = 2,128.46 × 725.12
4. Step 4: Simplify right side
   1,418.83x = 1,543,378.27
5. Step 5: Solve for x
   x = 1,543,378.27/1,418.83
6. Step 6: Final answer
   x = 1,087.79