Finding the Fourth Proportional to 3,100.35, 4,272.71 and 2,105.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.35 : 4,272.71 = 2,105.67 : x
2. Step 2: Convert to fraction form
   3,100.35/4,272.71 = 2,105.67/x
3. Step 3: Cross multiply
   3,100.35x = 4,272.71 × 2,105.67
4. Step 4: Simplify right side
   3,100.35x = 8,996,906.74
5. Step 5: Solve for x
   x = 8,996,906.74/3,100.35
6. Step 6: Final answer
   x = 2,901.90