Finding the Fourth Proportional to 1,381.72, 1,906.56 and 884.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.72 : 1,906.56 = 884.80 : x
2. Step 2: Convert to fraction form
   1,381.72/1,906.56 = 884.80/x
3. Step 3: Cross multiply
   1,381.72x = 1,906.56 × 884.80
4. Step 4: Simplify right side
   1,381.72x = 1,686,924.29
5. Step 5: Solve for x
   x = 1,686,924.29/1,381.72
6. Step 6: Final answer
   x = 1,220.89