Finding the Fourth Proportional to 2,922.89, 4,381.83 and 1,278.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,922.89 : 4,381.83 = 1,278.20 : x
2. Step 2: Convert to fraction form
   2,922.89/4,381.83 = 1,278.20/x
3. Step 3: Cross multiply
   2,922.89x = 4,381.83 × 1,278.20
4. Step 4: Simplify right side
   2,922.89x = 5,600,833.20
5. Step 5: Solve for x
   x = 5,600,833.20/2,922.89
6. Step 6: Final answer
   x = 1,916.20