Finding the Fourth Proportional to 3,993.17, 5,978.00 and 2,957.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.17 : 5,978.00 = 2,957.78 : x
2. Step 2: Convert to fraction form
   3,993.17/5,978.00 = 2,957.78/x
3. Step 3: Cross multiply
   3,993.17x = 5,978.00 × 2,957.78
4. Step 4: Simplify right side
   3,993.17x = 17,681,631.18
5. Step 5: Solve for x
   x = 17,681,631.18/3,993.17
6. Step 6: Final answer
   x = 4,427.97