Finding the Fourth Proportional to 1,488.61, 2,236.15 and 1,215.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.61 : 2,236.15 = 1,215.37 : x
2. Step 2: Convert to fraction form
   1,488.61/2,236.15 = 1,215.37/x
3. Step 3: Cross multiply
   1,488.61x = 2,236.15 × 1,215.37
4. Step 4: Simplify right side
   1,488.61x = 2,717,738.44
5. Step 5: Solve for x
   x = 2,717,738.44/1,488.61
6. Step 6: Final answer
   x = 1,825.69