Finding the Fourth Proportional to 2,978.78, 4,472.01 and 2,947.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.78 : 4,472.01 = 2,947.73 : x
2. Step 2: Convert to fraction form
   2,978.78/4,472.01 = 2,947.73/x
3. Step 3: Cross multiply
   2,978.78x = 4,472.01 × 2,947.73
4. Step 4: Simplify right side
   2,978.78x = 13,182,255.68
5. Step 5: Solve for x
   x = 13,182,255.68/2,978.78
6. Step 6: Final answer
   x = 4,425.39