Finding the Fourth Proportional to 5,491.80, 8,242.56 and 5,190.48

Step by Step Solution

1. Step 1: Write the proportion equation
   5,491.80 : 8,242.56 = 5,190.48 : x
2. Step 2: Convert to fraction form
   5,491.80/8,242.56 = 5,190.48/x
3. Step 3: Cross multiply
   5,491.80x = 8,242.56 × 5,190.48
4. Step 4: Simplify right side
   5,491.80x = 42,782,842.83
5. Step 5: Solve for x
   x = 42,782,842.83/5,491.80
6. Step 6: Final answer
   x = 7,790.31