Finding the Fourth Proportional to 2,081.88, 3,122.39 and 620.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.88 : 3,122.39 = 620.70 : x
2. Step 2: Convert to fraction form
   2,081.88/3,122.39 = 620.70/x
3. Step 3: Cross multiply
   2,081.88x = 3,122.39 × 620.70
4. Step 4: Simplify right side
   2,081.88x = 1,938,064.37
5. Step 5: Solve for x
   x = 1,938,064.37/2,081.88
6. Step 6: Final answer
   x = 930.92