Finding the Fourth Proportional to 3,761.50, 5,190.87 and 2,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,761.50 : 5,190.87 = 2,105.50 : x
2. Step 2: Convert to fraction form
   3,761.50/5,190.87 = 2,105.50/x
3. Step 3: Cross multiply
   3,761.50x = 5,190.87 × 2,105.50
4. Step 4: Simplify right side
   3,761.50x = 10,929,376.79
5. Step 5: Solve for x
   x = 10,929,376.79/3,761.50
6. Step 6: Final answer
   x = 2,905.59