Finding the Fourth Proportional to 4,978.73, 6,866.17 and 4,142.21

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.73 : 6,866.17 = 4,142.21 : x
2. Step 2: Convert to fraction form
   4,978.73/6,866.17 = 4,142.21/x
3. Step 3: Cross multiply
   4,978.73x = 6,866.17 × 4,142.21
4. Step 4: Simplify right side
   4,978.73x = 28,441,073.35
5. Step 5: Solve for x
   x = 28,441,073.35/4,978.73
6. Step 6: Final answer
   x = 5,712.51