Finding the Fourth Proportional to 5,421.72, 7,480.72 and 4,080.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,421.72 : 7,480.72 = 4,080.62 : x
2. Step 2: Convert to fraction form
   5,421.72/7,480.72 = 4,080.62/x
3. Step 3: Cross multiply
   5,421.72x = 7,480.72 × 4,080.62
4. Step 4: Simplify right side
   5,421.72x = 30,525,975.65
5. Step 5: Solve for x
   x = 30,525,975.65/5,421.72
6. Step 6: Final answer
   x = 5,630.31