Finding the Fourth Proportional to 2,112.89, 2,915.85 and 1,181.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.89 : 2,915.85 = 1,181.39 : x
2. Step 2: Convert to fraction form
   2,112.89/2,915.85 = 1,181.39/x
3. Step 3: Cross multiply
   2,112.89x = 2,915.85 × 1,181.39
4. Step 4: Simplify right side
   2,112.89x = 3,444,756.03
5. Step 5: Solve for x
   x = 3,444,756.03/2,112.89
6. Step 6: Final answer
   x = 1,630.35