Finding the Fourth Proportional to 2,081.93, 3,123.32 and 621.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.93 : 3,123.32 = 621.15 : x
2. Step 2: Convert to fraction form
   2,081.93/3,123.32 = 621.15/x
3. Step 3: Cross multiply
   2,081.93x = 3,123.32 × 621.15
4. Step 4: Simplify right side
   2,081.93x = 1,940,047.11
5. Step 5: Solve for x
   x = 1,940,047.11/2,081.93
6. Step 6: Final answer
   x = 931.85