Finding the Fourth Proportional to 3,385.51, 5,078.51 and 920.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,385.51 : 5,078.51 = 920.52 : x
2. Step 2: Convert to fraction form
   3,385.51/5,078.51 = 920.52/x
3. Step 3: Cross multiply
   3,385.51x = 5,078.51 × 920.52
4. Step 4: Simplify right side
   3,385.51x = 4,674,872.33
5. Step 5: Solve for x
   x = 4,674,872.33/3,385.51
6. Step 6: Final answer
   x = 1,380.85