Finding the Fourth Proportional to 21,581.46, 29,784.69 and 12,631.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.46 : 29,784.69 = 12,631.86 : x
2. Step 2: Convert to fraction form
   21,581.46/29,784.69 = 12,631.86/x
3. Step 3: Cross multiply
   21,581.46x = 29,784.69 × 12,631.86
4. Step 4: Simplify right side
   21,581.46x = 376,236,034.22
5. Step 5: Solve for x
   x = 376,236,034.22/21,581.46
6. Step 6: Final answer
   x = 17,433.30