Finding the Fourth Proportional to 2,878.31, 4,318.03 and 1,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.31 : 4,318.03 = 1,123.25 : x
2. Step 2: Convert to fraction form
   2,878.31/4,318.03 = 1,123.25/x
3. Step 3: Cross multiply
   2,878.31x = 4,318.03 × 1,123.25
4. Step 4: Simplify right side
   2,878.31x = 4,850,227.20
5. Step 5: Solve for x
   x = 4,850,227.20/2,878.31
6. Step 6: Final answer
   x = 1,685.10