Finding the Fourth Proportional to 3,109.01, 4,288.25 and 2,112.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.01 : 4,288.25 = 2,112.55 : x
2. Step 2: Convert to fraction form
   3,109.01/4,288.25 = 2,112.55/x
3. Step 3: Cross multiply
   3,109.01x = 4,288.25 × 2,112.55
4. Step 4: Simplify right side
   3,109.01x = 9,059,137.10
5. Step 5: Solve for x
   x = 9,059,137.10/3,109.01
6. Step 6: Final answer
   x = 2,913.84