Finding the Fourth Proportional to 2,107.69, 3,159.37 and 875.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.69 : 3,159.37 = 875.81 : x
2. Step 2: Convert to fraction form
   2,107.69/3,159.37 = 875.81/x
3. Step 3: Cross multiply
   2,107.69x = 3,159.37 × 875.81
4. Step 4: Simplify right side
   2,107.69x = 2,767,016.83
5. Step 5: Solve for x
   x = 2,767,016.83/2,107.69
6. Step 6: Final answer
   x = 1,312.82