Finding the Fourth Proportional to 2,665.86, 3,998.82 and 841.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.86 : 3,998.82 = 841.86 : x
2. Step 2: Convert to fraction form
   2,665.86/3,998.82 = 841.86/x
3. Step 3: Cross multiply
   2,665.86x = 3,998.82 × 841.86
4. Step 4: Simplify right side
   2,665.86x = 3,366,446.61
5. Step 5: Solve for x
   x = 3,366,446.61/2,665.86
6. Step 6: Final answer
   x = 1,262.80