Finding the Fourth Proportional to 2,105.72, 3,159.38 and 1,864.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.72 : 3,159.38 = 1,864.32 : x
2. Step 2: Convert to fraction form
   2,105.72/3,159.38 = 1,864.32/x
3. Step 3: Cross multiply
   2,105.72x = 3,159.38 × 1,864.32
4. Step 4: Simplify right side
   2,105.72x = 5,890,095.32
5. Step 5: Solve for x
   x = 5,890,095.32/2,105.72
6. Step 6: Final answer
   x = 2,797.19