Finding the Fourth Proportional to 2,081.52, 3,122.81 and 620.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.52 : 3,122.81 = 620.69 : x
2. Step 2: Convert to fraction form
   2,081.52/3,122.81 = 620.69/x
3. Step 3: Cross multiply
   2,081.52x = 3,122.81 × 620.69
4. Step 4: Simplify right side
   2,081.52x = 1,938,278.22
5. Step 5: Solve for x
   x = 1,938,278.22/2,081.52
6. Step 6: Final answer
   x = 931.18