Finding the Fourth Proportional to 2,878.67, 4,318.57 and 1,123.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.67 : 4,318.57 = 1,123.61 : x
2. Step 2: Convert to fraction form
   2,878.67/4,318.57 = 1,123.61/x
3. Step 3: Cross multiply
   2,878.67x = 4,318.57 × 1,123.61
4. Step 4: Simplify right side
   2,878.67x = 4,852,361.93
5. Step 5: Solve for x
   x = 4,852,361.93/2,878.67
6. Step 6: Final answer
   x = 1,685.62