Finding the Fourth Proportional to 2,938.53, 4,406.73 and 858.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,938.53 : 4,406.73 = 858.12 : x
2. Step 2: Convert to fraction form
   2,938.53/4,406.73 = 858.12/x
3. Step 3: Cross multiply
   2,938.53x = 4,406.73 × 858.12
4. Step 4: Simplify right side
   2,938.53x = 3,781,503.15
5. Step 5: Solve for x
   x = 3,781,503.15/2,938.53
6. Step 6: Final answer
   x = 1,286.87