Finding the Fourth Proportional to 7,308.78, 10,086.06 and 3,996.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,308.78 : 10,086.06 = 3,996.78 : x
2. Step 2: Convert to fraction form
   7,308.78/10,086.06 = 3,996.78/x
3. Step 3: Cross multiply
   7,308.78x = 10,086.06 × 3,996.78
4. Step 4: Simplify right side
   7,308.78x = 40,311,762.89
5. Step 5: Solve for x
   x = 40,311,762.89/7,308.78
6. Step 6: Final answer
   x = 5,515.53