Finding the Fourth Proportional to 2,162.39, 3,243.47 and 930.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.39 : 3,243.47 = 930.57 : x
2. Step 2: Convert to fraction form
   2,162.39/3,243.47 = 930.57/x
3. Step 3: Cross multiply
   2,162.39x = 3,243.47 × 930.57
4. Step 4: Simplify right side
   2,162.39x = 3,018,271.23
5. Step 5: Solve for x
   x = 3,018,271.23/2,162.39
6. Step 6: Final answer
   x = 1,395.81