Finding the Fourth Proportional to 12,419.74, 17,136.32 and 8,394.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.74 : 17,136.32 = 8,394.06 : x
2. Step 2: Convert to fraction form
   12,419.74/17,136.32 = 8,394.06/x
3. Step 3: Cross multiply
   12,419.74x = 17,136.32 × 8,394.06
4. Step 4: Simplify right side
   12,419.74x = 143,843,320.55
5. Step 5: Solve for x
   x = 143,843,320.55/12,419.74
6. Step 6: Final answer
   x = 11,581.83