Finding the Fourth Proportional to 2,112.59, 2,915.25 and 1,228.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.59 : 2,915.25 = 1,228.34 : x
2. Step 2: Convert to fraction form
   2,112.59/2,915.25 = 1,228.34/x
3. Step 3: Cross multiply
   2,112.59x = 2,915.25 × 1,228.34
4. Step 4: Simplify right side
   2,112.59x = 3,580,918.19
5. Step 5: Solve for x
   x = 3,580,918.19/2,112.59
6. Step 6: Final answer
   x = 1,695.04