Finding the Fourth Proportional to 3,678.78, 5,518.41 and 1,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.78 : 5,518.41 = 1,081.50 : x
2. Step 2: Convert to fraction form
   3,678.78/5,518.41 = 1,081.50/x
3. Step 3: Cross multiply
   3,678.78x = 5,518.41 × 1,081.50
4. Step 4: Simplify right side
   3,678.78x = 5,968,160.42
5. Step 5: Solve for x
   x = 5,968,160.42/3,678.78
6. Step 6: Final answer
   x = 1,622.32