Finding the Fourth Proportional to 2,342.32, 3,231.42 and 2,155.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,342.32 : 3,231.42 = 2,155.78 : x
2. Step 2: Convert to fraction form
   2,342.32/3,231.42 = 2,155.78/x
3. Step 3: Cross multiply
   2,342.32x = 3,231.42 × 2,155.78
4. Step 4: Simplify right side
   2,342.32x = 6,966,230.61
5. Step 5: Solve for x
   x = 6,966,230.61/2,342.32
6. Step 6: Final answer
   x = 2,974.07