Finding the Fourth Proportional to 12,386.59, 17,107.69 and 8,156.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,386.59 : 17,107.69 = 8,156.56 : x
2. Step 2: Convert to fraction form
   12,386.59/17,107.69 = 8,156.56/x
3. Step 3: Cross multiply
   12,386.59x = 17,107.69 × 8,156.56
4. Step 4: Simplify right side
   12,386.59x = 139,539,899.95
5. Step 5: Solve for x
   x = 139,539,899.95/12,386.59
6. Step 6: Final answer
   x = 11,265.40