Finding the Fourth Proportional to 1,583.88, 2,185.56 and 885.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,583.88 : 2,185.56 = 885.40 : x
2. Step 2: Convert to fraction form
   1,583.88/2,185.56 = 885.40/x
3. Step 3: Cross multiply
   1,583.88x = 2,185.56 × 885.40
4. Step 4: Simplify right side
   1,583.88x = 1,935,094.82
5. Step 5: Solve for x
   x = 1,935,094.82/1,583.88
6. Step 6: Final answer
   x = 1,221.74