Finding the Fourth Proportional to 3,338.89, 5,008.28 and 998.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,338.89 : 5,008.28 = 998.91 : x
2. Step 2: Convert to fraction form
   3,338.89/5,008.28 = 998.91/x
3. Step 3: Cross multiply
   3,338.89x = 5,008.28 × 998.91
4. Step 4: Simplify right side
   3,338.89x = 5,002,815.98
5. Step 5: Solve for x
   x = 5,002,815.98/3,338.89
6. Step 6: Final answer
   x = 1,498.35