Finding the Fourth Proportional to 12,386.34, 17,107.34 and 8,156.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,386.34 : 17,107.34 = 8,156.31 : x
2. Step 2: Convert to fraction form
   12,386.34/17,107.34 = 8,156.31/x
3. Step 3: Cross multiply
   12,386.34x = 17,107.34 × 8,156.31
4. Step 4: Simplify right side
   12,386.34x = 139,532,788.71
5. Step 5: Solve for x
   x = 139,532,788.71/12,386.34
6. Step 6: Final answer
   x = 11,265.06