Finding the Fourth Proportional to 4,978.49, 6,870.43 and 2,740.15

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.49 : 6,870.43 = 2,740.15 : x
2. Step 2: Convert to fraction form
   4,978.49/6,870.43 = 2,740.15/x
3. Step 3: Cross multiply
   4,978.49x = 6,870.43 × 2,740.15
4. Step 4: Simplify right side
   4,978.49x = 18,825,984.74
5. Step 5: Solve for x
   x = 18,825,984.74/4,978.49
6. Step 6: Final answer
   x = 3,781.47