Finding the Fourth Proportional to 2,081.55, 3,122.73 and 620.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.55 : 3,122.73 = 620.67 : x
2. Step 2: Convert to fraction form
   2,081.55/3,122.73 = 620.67/x
3. Step 3: Cross multiply
   2,081.55x = 3,122.73 × 620.67
4. Step 4: Simplify right side
   2,081.55x = 1,938,184.83
5. Step 5: Solve for x
   x = 1,938,184.83/2,081.55
6. Step 6: Final answer
   x = 931.13