Finding the Fourth Proportional to 2,642.23, 3,964.98 and 998.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.23 : 3,964.98 = 998.56 : x
2. Step 2: Convert to fraction form
   2,642.23/3,964.98 = 998.56/x
3. Step 3: Cross multiply
   2,642.23x = 3,964.98 × 998.56
4. Step 4: Simplify right side
   2,642.23x = 3,959,250.60
5. Step 5: Solve for x
   x = 3,959,250.60/2,642.23
6. Step 6: Final answer
   x = 1,498.45