Finding the Fourth Proportional to 2,081.40, 3,120.96 and 620.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.40 : 3,120.96 = 620.34 : x
2. Step 2: Convert to fraction form
   2,081.40/3,120.96 = 620.34/x
3. Step 3: Cross multiply
   2,081.40x = 3,120.96 × 620.34
4. Step 4: Simplify right side
   2,081.40x = 1,936,056.33
5. Step 5: Solve for x
   x = 1,936,056.33/2,081.40
6. Step 6: Final answer
   x = 930.17