Finding the Fourth Proportional to 12,385.59, 17,106.31 and 8,155.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,385.59 : 17,106.31 = 8,155.56 : x
2. Step 2: Convert to fraction form
   12,385.59/17,106.31 = 8,155.56/x
3. Step 3: Cross multiply
   12,385.59x = 17,106.31 × 8,155.56
4. Step 4: Simplify right side
   12,385.59x = 139,511,499.06
5. Step 5: Solve for x
   x = 139,511,499.06/12,385.59
6. Step 6: Final answer
   x = 11,264.02