Finding the Fourth Proportional to 12,647.84, 17,450.52 and 8,171.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,647.84 : 17,450.52 = 8,171.78 : x
2. Step 2: Convert to fraction form
   12,647.84/17,450.52 = 8,171.78/x
3. Step 3: Cross multiply
   12,647.84x = 17,450.52 × 8,171.78
4. Step 4: Simplify right side
   12,647.84x = 142,601,810.33
5. Step 5: Solve for x
   x = 142,601,810.33/12,647.84
6. Step 6: Final answer
   x = 11,274.80