Finding the Fourth Proportional to 2,520.45, 3,780.55 and 765.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.45 : 3,780.55 = 765.37 : x
2. Step 2: Convert to fraction form
   2,520.45/3,780.55 = 765.37/x
3. Step 3: Cross multiply
   2,520.45x = 3,780.55 × 765.37
4. Step 4: Simplify right side
   2,520.45x = 2,893,519.55
5. Step 5: Solve for x
   x = 2,893,519.55/2,520.45
6. Step 6: Final answer
   x = 1,148.02