Finding the Fourth Proportional to 3,934.86, 5,428.89 and 2,340.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,934.86 : 5,428.89 = 2,340.78 : x
2. Step 2: Convert to fraction form
   3,934.86/5,428.89 = 2,340.78/x
3. Step 3: Cross multiply
   3,934.86x = 5,428.89 × 2,340.78
4. Step 4: Simplify right side
   3,934.86x = 12,707,837.13
5. Step 5: Solve for x
   x = 12,707,837.13/3,934.86
6. Step 6: Final answer
   x = 3,229.55