Finding the Fourth Proportional to 2,015.61, 2,782.83 and 1,643.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.61 : 2,782.83 = 1,643.49 : x
2. Step 2: Convert to fraction form
   2,015.61/2,782.83 = 1,643.49/x
3. Step 3: Cross multiply
   2,015.61x = 2,782.83 × 1,643.49
4. Step 4: Simplify right side
   2,015.61x = 4,573,553.28
5. Step 5: Solve for x
   x = 4,573,553.28/2,015.61
6. Step 6: Final answer
   x = 2,269.07