Finding the Fourth Proportional to 1,380.89, 1,906.08 and 884.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.89 : 1,906.08 = 884.85 : x
2. Step 2: Convert to fraction form
   1,380.89/1,906.08 = 884.85/x
3. Step 3: Cross multiply
   1,380.89x = 1,906.08 × 884.85
4. Step 4: Simplify right side
   1,380.89x = 1,686,594.89
5. Step 5: Solve for x
   x = 1,686,594.89/1,380.89
6. Step 6: Final answer
   x = 1,221.39