Finding the Fourth Proportional to 1,381.61, 1,906.86 and 884.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.61 : 1,906.86 = 884.23 : x
2. Step 2: Convert to fraction form
   1,381.61/1,906.86 = 884.23/x
3. Step 3: Cross multiply
   1,381.61x = 1,906.86 × 884.23
4. Step 4: Simplify right side
   1,381.61x = 1,686,102.82
5. Step 5: Solve for x
   x = 1,686,102.82/1,381.61
6. Step 6: Final answer
   x = 1,220.39