Finding the Fourth Proportional to 9,628.98, 13,287.90 and 5,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.98 : 13,287.90 = 5,380.78 : x
2. Step 2: Convert to fraction form
   9,628.98/13,287.90 = 5,380.78/x
3. Step 3: Cross multiply
   9,628.98x = 13,287.90 × 5,380.78
4. Step 4: Simplify right side
   9,628.98x = 71,499,233.65
5. Step 5: Solve for x
   x = 71,499,233.65/9,628.98
6. Step 6: Final answer
   x = 7,425.42