Finding the Fourth Proportional to 13,009.21, 19,522.62 and 8,081.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,009.21 : 19,522.62 = 8,081.57 : x
2. Step 2: Convert to fraction form
   13,009.21/19,522.62 = 8,081.57/x
3. Step 3: Cross multiply
   13,009.21x = 19,522.62 × 8,081.57
4. Step 4: Simplify right side
   13,009.21x = 157,773,468.92
5. Step 5: Solve for x
   x = 157,773,468.92/13,009.21
6. Step 6: Final answer
   x = 12,127.83