Finding the Fourth Proportional to 8,021.23, 12,019.59 and 5,090.65

Step by Step Solution

1. Step 1: Write the proportion equation
   8,021.23 : 12,019.59 = 5,090.65 : x
2. Step 2: Convert to fraction form
   8,021.23/12,019.59 = 5,090.65/x
3. Step 3: Cross multiply
   8,021.23x = 12,019.59 × 5,090.65
4. Step 4: Simplify right side
   8,021.23x = 61,187,495.78
5. Step 5: Solve for x
   x = 61,187,495.78/8,021.23
6. Step 6: Final answer
   x = 7,628.20