Finding the Fourth Proportional to 3,109.29, 4,288.65 and 2,112.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.29 : 4,288.65 = 2,112.89 : x
2. Step 2: Convert to fraction form
   3,109.29/4,288.65 = 2,112.89/x
3. Step 3: Cross multiply
   3,109.29x = 4,288.65 × 2,112.89
4. Step 4: Simplify right side
   3,109.29x = 9,061,416.33
5. Step 5: Solve for x
   x = 9,061,416.33/3,109.29
6. Step 6: Final answer
   x = 2,914.31