Finding the Fourth Proportional to 2,558.87, 3,838.18 and 999.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.87 : 3,838.18 = 999.15 : x
2. Step 2: Convert to fraction form
   2,558.87/3,838.18 = 999.15/x
3. Step 3: Cross multiply
   2,558.87x = 3,838.18 × 999.15
4. Step 4: Simplify right side
   2,558.87x = 3,834,934.91
5. Step 5: Solve for x
   x = 3,834,934.91/2,558.87
6. Step 6: Final answer
   x = 1,498.69