Finding the Fourth Proportional to 4,978.93, 6,870.78 and 2,854.39

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.93 : 6,870.78 = 2,854.39 : x
2. Step 2: Convert to fraction form
   4,978.93/6,870.78 = 2,854.39/x
3. Step 3: Cross multiply
   4,978.93x = 6,870.78 × 2,854.39
4. Step 4: Simplify right side
   4,978.93x = 19,611,885.72
5. Step 5: Solve for x
   x = 19,611,885.72/4,978.93
6. Step 6: Final answer
   x = 3,938.98