Finding the Fourth Proportional to 12,860.31, 17,739.29 and 8,825.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,860.31 : 17,739.29 = 8,825.30 : x
2. Step 2: Convert to fraction form
   12,860.31/17,739.29 = 8,825.30/x
3. Step 3: Cross multiply
   12,860.31x = 17,739.29 × 8,825.30
4. Step 4: Simplify right side
   12,860.31x = 156,554,506.28
5. Step 5: Solve for x
   x = 156,554,506.28/12,860.31
6. Step 6: Final answer
   x = 12,173.46