Finding the Fourth Proportional to 3,776.50, 5,211.89 and 2,120.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,776.50 : 5,211.89 = 2,120.82 : x
2. Step 2: Convert to fraction form
   3,776.50/5,211.89 = 2,120.82/x
3. Step 3: Cross multiply
   3,776.50x = 5,211.89 × 2,120.82
4. Step 4: Simplify right side
   3,776.50x = 11,053,480.55
5. Step 5: Solve for x
   x = 11,053,480.55/3,776.50
6. Step 6: Final answer
   x = 2,926.91