Finding the Fourth Proportional to 2,105.10, 3,159.45 and 936.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.10 : 3,159.45 = 936.90 : x
2. Step 2: Convert to fraction form
   2,105.10/3,159.45 = 936.90/x
3. Step 3: Cross multiply
   2,105.10x = 3,159.45 × 936.90
4. Step 4: Simplify right side
   2,105.10x = 2,960,088.71
5. Step 5: Solve for x
   x = 2,960,088.71/2,105.10
6. Step 6: Final answer
   x = 1,406.15