Finding the Fourth Proportional to 2,081.86, 3,122.43 and 620.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.86 : 3,122.43 = 620.67 : x
2. Step 2: Convert to fraction form
   2,081.86/3,122.43 = 620.67/x
3. Step 3: Cross multiply
   2,081.86x = 3,122.43 × 620.67
4. Step 4: Simplify right side
   2,081.86x = 1,937,984.59
5. Step 5: Solve for x
   x = 1,937,984.59/2,081.86
6. Step 6: Final answer
   x = 930.89