Finding the Fourth Proportional to 2,859.82, 4,288.35 and 1,215.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.82 : 4,288.35 = 1,215.47 : x
2. Step 2: Convert to fraction form
   2,859.82/4,288.35 = 1,215.47/x
3. Step 3: Cross multiply
   2,859.82x = 4,288.35 × 1,215.47
4. Step 4: Simplify right side
   2,859.82x = 5,212,376.05
5. Step 5: Solve for x
   x = 5,212,376.05/2,859.82
6. Step 6: Final answer
   x = 1,822.63