Finding the Fourth Proportional to 2,558.86, 3,838.37 and 998.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.86 : 3,838.37 = 998.80 : x
2. Step 2: Convert to fraction form
   2,558.86/3,838.37 = 998.80/x
3. Step 3: Cross multiply
   2,558.86x = 3,838.37 × 998.80
4. Step 4: Simplify right side
   2,558.86x = 3,833,749.37
5. Step 5: Solve for x
   x = 3,833,749.37/2,558.86
6. Step 6: Final answer
   x = 1,498.23