Finding the Fourth Proportional to 2,642.16, 3,963.83 and 998.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.16 : 3,963.83 = 998.72 : x
2. Step 2: Convert to fraction form
   2,642.16/3,963.83 = 998.72/x
3. Step 3: Cross multiply
   2,642.16x = 3,963.83 × 998.72
4. Step 4: Simplify right side
   2,642.16x = 3,958,731.48
5. Step 5: Solve for x
   x = 3,958,731.48/2,642.16
6. Step 6: Final answer
   x = 1,498.29