Finding the Fourth Proportional to 2,641.86, 3,962.83 and 999.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,641.86 : 3,962.83 = 999.18 : x
2. Step 2: Convert to fraction form
   2,641.86/3,962.83 = 999.18/x
3. Step 3: Cross multiply
   2,641.86x = 3,962.83 × 999.18
4. Step 4: Simplify right side
   2,641.86x = 3,959,560.67
5. Step 5: Solve for x
   x = 3,959,560.67/2,641.86
6. Step 6: Final answer
   x = 1,498.78