Finding the Fourth Proportional to 2,878.20, 4,317.84 and 930.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.20 : 4,317.84 = 930.42 : x
2. Step 2: Convert to fraction form
   2,878.20/4,317.84 = 930.42/x
3. Step 3: Cross multiply
   2,878.20x = 4,317.84 × 930.42
4. Step 4: Simplify right side
   2,878.20x = 4,017,404.69
5. Step 5: Solve for x
   x = 4,017,404.69/2,878.20
6. Step 6: Final answer
   x = 1,395.80