Finding the Fourth Proportional to 2,081.94, 3,123.09 and 621.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.94 : 3,123.09 = 621.11 : x
2. Step 2: Convert to fraction form
   2,081.94/3,123.09 = 621.11/x
3. Step 3: Cross multiply
   2,081.94x = 3,123.09 × 621.11
4. Step 4: Simplify right side
   2,081.94x = 1,939,766.81
5. Step 5: Solve for x
   x = 1,939,766.81/2,081.94
6. Step 6: Final answer
   x = 931.71