Finding the Fourth Proportional to 5,680.56, 7,830.72 and 3,996.48

Step by Step Solution

1. Step 1: Write the proportion equation
   5,680.56 : 7,830.72 = 3,996.48 : x
2. Step 2: Convert to fraction form
   5,680.56/7,830.72 = 3,996.48/x
3. Step 3: Cross multiply
   5,680.56x = 7,830.72 × 3,996.48
4. Step 4: Simplify right side
   5,680.56x = 31,295,315.87
5. Step 5: Solve for x
   x = 31,295,315.87/5,680.56
6. Step 6: Final answer
   x = 5,509.20