Finding the Fourth Proportional to 13,012.25, 17,959.73 and 8,231.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,012.25 : 17,959.73 = 8,231.90 : x
2. Step 2: Convert to fraction form
   13,012.25/17,959.73 = 8,231.90/x
3. Step 3: Cross multiply
   13,012.25x = 17,959.73 × 8,231.90
4. Step 4: Simplify right side
   13,012.25x = 147,842,570.43
5. Step 5: Solve for x
   x = 147,842,570.43/13,012.25
6. Step 6: Final answer
   x = 11,361.80