Finding the Fourth Proportional to 12,609.84, 17,405.78 and 8,642.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,609.84 : 17,405.78 = 8,642.46 : x
2. Step 2: Convert to fraction form
   12,609.84/17,405.78 = 8,642.46/x
3. Step 3: Cross multiply
   12,609.84x = 17,405.78 × 8,642.46
4. Step 4: Simplify right side
   12,609.84x = 150,428,714.21
5. Step 5: Solve for x
   x = 150,428,714.21/12,609.84
6. Step 6: Final answer
   x = 11,929.47