Finding the Fourth Proportional to 19,388.84, 26,749.59 and 12,678.34

Step by Step Solution

1. Step 1: Write the proportion equation
   19,388.84 : 26,749.59 = 12,678.34 : x
2. Step 2: Convert to fraction form
   19,388.84/26,749.59 = 12,678.34/x
3. Step 3: Cross multiply
   19,388.84x = 26,749.59 × 12,678.34
4. Step 4: Simplify right side
   19,388.84x = 339,140,396.88
5. Step 5: Solve for x
   x = 339,140,396.88/19,388.84
6. Step 6: Final answer
   x = 17,491.53