Finding the Fourth Proportional to 3,389.07, 5,082.78 and 923.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.07 : 5,082.78 = 923.91 : x
2. Step 2: Convert to fraction form
   3,389.07/5,082.78 = 923.91/x
3. Step 3: Cross multiply
   3,389.07x = 5,082.78 × 923.91
4. Step 4: Simplify right side
   3,389.07x = 4,696,005.86
5. Step 5: Solve for x
   x = 4,696,005.86/3,389.07
6. Step 6: Final answer
   x = 1,385.63