Finding the Fourth Proportional to 2,112.78, 2,915.55 and 1,181.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.78 : 2,915.55 = 1,181.22 : x
2. Step 2: Convert to fraction form
   2,112.78/2,915.55 = 1,181.22/x
3. Step 3: Cross multiply
   2,112.78x = 2,915.55 × 1,181.22
4. Step 4: Simplify right side
   2,112.78x = 3,443,905.97
5. Step 5: Solve for x
   x = 3,443,905.97/2,112.78
6. Step 6: Final answer
   x = 1,630.04