Finding the Fourth Proportional to 4,978.99, 6,870.88 and 2,740.57

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.99 : 6,870.88 = 2,740.57 : x
2. Step 2: Convert to fraction form
   4,978.99/6,870.88 = 2,740.57/x
3. Step 3: Cross multiply
   4,978.99x = 6,870.88 × 2,740.57
4. Step 4: Simplify right side
   4,978.99x = 18,830,098.43
5. Step 5: Solve for x
   x = 18,830,098.43/4,978.99
6. Step 6: Final answer
   x = 3,781.91