Finding the Fourth Proportional to 2,643.71, 3,962.18 and 998.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.71 : 3,962.18 = 998.30 : x
2. Step 2: Convert to fraction form
   2,643.71/3,962.18 = 998.30/x
3. Step 3: Cross multiply
   2,643.71x = 3,962.18 × 998.30
4. Step 4: Simplify right side
   2,643.71x = 3,955,444.29
5. Step 5: Solve for x
   x = 3,955,444.29/2,643.71
6. Step 6: Final answer
   x = 1,496.17