Finding the Fourth Proportional to 12,904.89, 17,816.51 and 8,436.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.89 : 17,816.51 = 8,436.12 : x
2. Step 2: Convert to fraction form
   12,904.89/17,816.51 = 8,436.12/x
3. Step 3: Cross multiply
   12,904.89x = 17,816.51 × 8,436.12
4. Step 4: Simplify right side
   12,904.89x = 150,302,123.17
5. Step 5: Solve for x
   x = 150,302,123.17/12,904.89
6. Step 6: Final answer
   x = 11,646.92