Finding the Fourth Proportional to 12,905.89, 17,817.89 and 8,437.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,905.89 : 17,817.89 = 8,437.12 : x
2. Step 2: Convert to fraction form
   12,905.89/17,817.89 = 8,437.12/x
3. Step 3: Cross multiply
   12,905.89x = 17,817.89 × 8,437.12
4. Step 4: Simplify right side
   12,905.89x = 150,331,676.08
5. Step 5: Solve for x
   x = 150,331,676.08/12,905.89
6. Step 6: Final answer
   x = 11,648.30