Finding the Fourth Proportional to 2,081.62, 3,123.03 and 620.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.62 : 3,123.03 = 620.80 : x
2. Step 2: Convert to fraction form
   2,081.62/3,123.03 = 620.80/x
3. Step 3: Cross multiply
   2,081.62x = 3,123.03 × 620.80
4. Step 4: Simplify right side
   2,081.62x = 1,938,777.02
5. Step 5: Solve for x
   x = 1,938,777.02/2,081.62
6. Step 6: Final answer
   x = 931.38