Finding the Fourth Proportional to 4,978.35, 6,870.43 and 2,740.42

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.35 : 6,870.43 = 2,740.42 : x
2. Step 2: Convert to fraction form
   4,978.35/6,870.43 = 2,740.42/x
3. Step 3: Cross multiply
   4,978.35x = 6,870.43 × 2,740.42
4. Step 4: Simplify right side
   4,978.35x = 18,827,863.78
5. Step 5: Solve for x
   x = 18,827,863.78/4,978.35
6. Step 6: Final answer
   x = 3,781.95