Finding the Fourth Proportional to 2,112.81, 2,915.77 and 1,181.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.81 : 2,915.77 = 1,181.31 : x
2. Step 2: Convert to fraction form
   2,112.81/2,915.77 = 1,181.31/x
3. Step 3: Cross multiply
   2,112.81x = 2,915.77 × 1,181.31
4. Step 4: Simplify right side
   2,112.81x = 3,444,428.26
5. Step 5: Solve for x
   x = 3,444,428.26/2,112.81
6. Step 6: Final answer
   x = 1,630.26