Finding the Fourth Proportional to 2,109.57, 3,162.79 and 1,012.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.57 : 3,162.79 = 1,012.89 : x
2. Step 2: Convert to fraction form
   2,109.57/3,162.79 = 1,012.89/x
3. Step 3: Cross multiply
   2,109.57x = 3,162.79 × 1,012.89
4. Step 4: Simplify right side
   2,109.57x = 3,203,558.36
5. Step 5: Solve for x
   x = 3,203,558.36/2,109.57
6. Step 6: Final answer
   x = 1,518.58