Finding the Fourth Proportional to 2,082.86, 3,123.93 and 621.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.86 : 3,123.93 = 621.67 : x
2. Step 2: Convert to fraction form
   2,082.86/3,123.93 = 621.67/x
3. Step 3: Cross multiply
   2,082.86x = 3,123.93 × 621.67
4. Step 4: Simplify right side
   2,082.86x = 1,942,053.56
5. Step 5: Solve for x
   x = 1,942,053.56/2,082.86
6. Step 6: Final answer
   x = 932.40