Finding the Fourth Proportional to 2,081.24, 3,120.94 and 620.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.24 : 3,120.94 = 620.10 : x
2. Step 2: Convert to fraction form
   2,081.24/3,120.94 = 620.10/x
3. Step 3: Cross multiply
   2,081.24x = 3,120.94 × 620.10
4. Step 4: Simplify right side
   2,081.24x = 1,935,294.89
5. Step 5: Solve for x
   x = 1,935,294.89/2,081.24
6. Step 6: Final answer
   x = 929.88