Finding the Fourth Proportional to 7,500.78, 11,261.54 and 3,805.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,500.78 : 11,261.54 = 3,805.61 : x
2. Step 2: Convert to fraction form
   7,500.78/11,261.54 = 3,805.61/x
3. Step 3: Cross multiply
   7,500.78x = 11,261.54 × 3,805.61
4. Step 4: Simplify right side
   7,500.78x = 42,856,982.45
5. Step 5: Solve for x
   x = 42,856,982.45/7,500.78
6. Step 6: Final answer
   x = 5,713.67