Finding the Fourth Proportional to 2,947.34, 4,419.39 and 998.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,947.34 : 4,419.39 = 998.78 : x
2. Step 2: Convert to fraction form
   2,947.34/4,419.39 = 998.78/x
3. Step 3: Cross multiply
   2,947.34x = 4,419.39 × 998.78
4. Step 4: Simplify right side
   2,947.34x = 4,413,998.34
5. Step 5: Solve for x
   x = 4,413,998.34/2,947.34
6. Step 6: Final answer
   x = 1,497.62