Finding the Fourth Proportional to 13,021.59, 17,971.59 and 7,984.92

Step by Step Solution

1. Step 1: Write the proportion equation
   13,021.59 : 17,971.59 = 7,984.92 : x
2. Step 2: Convert to fraction form
   13,021.59/17,971.59 = 7,984.92/x
3. Step 3: Cross multiply
   13,021.59x = 17,971.59 × 7,984.92
4. Step 4: Simplify right side
   13,021.59x = 143,501,708.42
5. Step 5: Solve for x
   x = 143,501,708.42/13,021.59
6. Step 6: Final answer
   x = 11,020.29