Finding the Fourth Proportional to 2,112.48, 2,915.22 and 1,228.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.48 : 2,915.22 = 1,228.32 : x
2. Step 2: Convert to fraction form
   2,112.48/2,915.22 = 1,228.32/x
3. Step 3: Cross multiply
   2,112.48x = 2,915.22 × 1,228.32
4. Step 4: Simplify right side
   2,112.48x = 3,580,823.03
5. Step 5: Solve for x
   x = 3,580,823.03/2,112.48
6. Step 6: Final answer
   x = 1,695.08