Finding the Fourth Proportional to 12,436.78, 17,155.95 and 8,653.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,436.78 : 17,155.95 = 8,653.96 : x
2. Step 2: Convert to fraction form
   12,436.78/17,155.95 = 8,653.96/x
3. Step 3: Cross multiply
   12,436.78x = 17,155.95 × 8,653.96
4. Step 4: Simplify right side
   12,436.78x = 148,466,905.06
5. Step 5: Solve for x
   x = 148,466,905.06/12,436.78
6. Step 6: Final answer
   x = 11,937.73