Finding the Fourth Proportional to 3,109.32, 4,288.61 and 2,112.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.32 : 4,288.61 = 2,112.82 : x
2. Step 2: Convert to fraction form
   3,109.32/4,288.61 = 2,112.82/x
3. Step 3: Cross multiply
   3,109.32x = 4,288.61 × 2,112.82
4. Step 4: Simplify right side
   3,109.32x = 9,061,055.54
5. Step 5: Solve for x
   x = 9,061,055.54/3,109.32
6. Step 6: Final answer
   x = 2,914.16