Finding the Fourth Proportional to 2,878.98, 4,317.57 and 930.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.98 : 4,317.57 = 930.78 : x
2. Step 2: Convert to fraction form
   2,878.98/4,317.57 = 930.78/x
3. Step 3: Cross multiply
   2,878.98x = 4,317.57 × 930.78
4. Step 4: Simplify right side
   2,878.98x = 4,018,707.80
5. Step 5: Solve for x
   x = 4,018,707.80/2,878.98
6. Step 6: Final answer
   x = 1,395.88