Finding the Fourth Proportional to 2,105.65, 3,159.15 and 1,010.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.65 : 3,159.15 = 1,010.09 : x
2. Step 2: Convert to fraction form
   2,105.65/3,159.15 = 1,010.09/x
3. Step 3: Cross multiply
   2,105.65x = 3,159.15 × 1,010.09
4. Step 4: Simplify right side
   2,105.65x = 3,191,004.98
5. Step 5: Solve for x
   x = 3,191,004.98/2,105.65
6. Step 6: Final answer
   x = 1,515.45