Finding the Fourth Proportional to 1,583.31, 2,185.16 and 884.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,583.31 : 2,185.16 = 884.55 : x
2. Step 2: Convert to fraction form
   1,583.31/2,185.16 = 884.55/x
3. Step 3: Cross multiply
   1,583.31x = 2,185.16 × 884.55
4. Step 4: Simplify right side
   1,583.31x = 1,932,878.86
5. Step 5: Solve for x
   x = 1,932,878.86/1,583.31
6. Step 6: Final answer
   x = 1,220.78