Finding the Fourth Proportional to 2,112.31, 2,915.00 and 1,155.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.31 : 2,915.00 = 1,155.25 : x
2. Step 2: Convert to fraction form
   2,112.31/2,915.00 = 1,155.25/x
3. Step 3: Cross multiply
   2,112.31x = 2,915.00 × 1,155.25
4. Step 4: Simplify right side
   2,112.31x = 3,367,546.05
5. Step 5: Solve for x
   x = 3,367,546.05/2,112.31
6. Step 6: Final answer
   x = 1,594.25