Finding the Fourth Proportional to 12,404.13, 17,118.78 and 6,816.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,404.13 : 17,118.78 = 6,816.21 : x
2. Step 2: Convert to fraction form
   12,404.13/17,118.78 = 6,816.21/x
3. Step 3: Cross multiply
   12,404.13x = 17,118.78 × 6,816.21
4. Step 4: Simplify right side
   12,404.13x = 116,685,079.75
5. Step 5: Solve for x
   x = 116,685,079.75/12,404.13
6. Step 6: Final answer
   x = 9,406.96