Finding the Fourth Proportional to 12,421.74, 17,137.83 and 8,435.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,421.74 : 17,137.83 = 8,435.94 : x
2. Step 2: Convert to fraction form
   12,421.74/17,137.83 = 8,435.94/x
3. Step 3: Cross multiply
   12,421.74x = 17,137.83 × 8,435.94
4. Step 4: Simplify right side
   12,421.74x = 144,573,705.61
5. Step 5: Solve for x
   x = 144,573,705.61/12,421.74
6. Step 6: Final answer
   x = 11,638.76