Finding the Fourth Proportional to 2,082.78, 3,124.18 and 621.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.78 : 3,124.18 = 621.94 : x
2. Step 2: Convert to fraction form
   2,082.78/3,124.18 = 621.94/x
3. Step 3: Cross multiply
   2,082.78x = 3,124.18 × 621.94
4. Step 4: Simplify right side
   2,082.78x = 1,943,052.51
5. Step 5: Solve for x
   x = 1,943,052.51/2,082.78
6. Step 6: Final answer
   x = 932.91