Finding the Fourth Proportional to 12,419.39, 17,129.57 and 9,011.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,419.39 : 17,129.57 = 9,011.54 : x
2. Step 2: Convert to fraction form
   12,419.39/17,129.57 = 9,011.54/x
3. Step 3: Cross multiply
   12,419.39x = 17,129.57 × 9,011.54
4. Step 4: Simplify right side
   12,419.39x = 154,363,803.00
5. Step 5: Solve for x
   x = 154,363,803.00/12,419.39
6. Step 6: Final answer
   x = 12,429.26