Finding the Fourth Proportional to 4,940.91, 7,414.98 and 3,978.63

Step by Step Solution

1. Step 1: Write the proportion equation
   4,940.91 : 7,414.98 = 3,978.63 : x
2. Step 2: Convert to fraction form
   4,940.91/7,414.98 = 3,978.63/x
3. Step 3: Cross multiply
   4,940.91x = 7,414.98 × 3,978.63
4. Step 4: Simplify right side
   4,940.91x = 29,501,461.88
5. Step 5: Solve for x
   x = 29,501,461.88/4,940.91
6. Step 6: Final answer
   x = 5,970.86