Finding the Fourth Proportional to 12,404.28, 17,126.98 and 8,621.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,404.28 : 17,126.98 = 8,621.12 : x
2. Step 2: Convert to fraction form
   12,404.28/17,126.98 = 8,621.12/x
3. Step 3: Cross multiply
   12,404.28x = 17,126.98 × 8,621.12
4. Step 4: Simplify right side
   12,404.28x = 147,653,749.82
5. Step 5: Solve for x
   x = 147,653,749.82/12,404.28
6. Step 6: Final answer
   x = 11,903.45