Finding the Fourth Proportional to 12,638.31, 17,437.36 and 8,162.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638.31 : 17,437.36 = 8,162.25 : x
2. Step 2: Convert to fraction form
   12,638.31/17,437.36 = 8,162.25/x
3. Step 3: Cross multiply
   12,638.31x = 17,437.36 × 8,162.25
4. Step 4: Simplify right side
   12,638.31x = 142,328,091.66
5. Step 5: Solve for x
   x = 142,328,091.66/12,638.31
6. Step 6: Final answer
   x = 11,261.64