Finding the Fourth Proportional to 2,661.39, 3,992.22 and 930.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.39 : 3,992.22 = 930.15 : x
2. Step 2: Convert to fraction form
   2,661.39/3,992.22 = 930.15/x
3. Step 3: Cross multiply
   2,661.39x = 3,992.22 × 930.15
4. Step 4: Simplify right side
   2,661.39x = 3,713,363.43
5. Step 5: Solve for x
   x = 3,713,363.43/2,661.39
6. Step 6: Final answer
   x = 1,395.27