Finding the Fourth Proportional to 1,380.87, 1,905.82 and 884.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.87 : 1,905.82 = 884.70 : x
2. Step 2: Convert to fraction form
   1,380.87/1,905.82 = 884.70/x
3. Step 3: Cross multiply
   1,380.87x = 1,905.82 × 884.70
4. Step 4: Simplify right side
   1,380.87x = 1,686,078.95
5. Step 5: Solve for x
   x = 1,686,078.95/1,380.87
6. Step 6: Final answer
   x = 1,221.03