Finding the Fourth Proportional to 3,678.81, 5,518.49 and 1,081.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.81 : 5,518.49 = 1,081.86 : x
2. Step 2: Convert to fraction form
   3,678.81/5,518.49 = 1,081.86/x
3. Step 3: Cross multiply
   3,678.81x = 5,518.49 × 1,081.86
4. Step 4: Simplify right side
   3,678.81x = 5,970,228.18
5. Step 5: Solve for x
   x = 5,970,228.18/3,678.81
6. Step 6: Final answer
   x = 1,622.87