Finding the Fourth Proportional to 11,621.48, 17,429.40 and 8,142.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,621.48 : 17,429.40 = 8,142.62 : x
2. Step 2: Convert to fraction form
   11,621.48/17,429.40 = 8,142.62/x
3. Step 3: Cross multiply
   11,621.48x = 17,429.40 × 8,142.62
4. Step 4: Simplify right side
   11,621.48x = 141,920,981.03
5. Step 5: Solve for x
   x = 141,920,981.03/11,621.48
6. Step 6: Final answer
   x = 12,211.95