Finding the Fourth Proportional to 12,146.40, 16,769.78 and 9,913.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,146.40 : 16,769.78 = 9,913.61 : x
2. Step 2: Convert to fraction form
   12,146.40/16,769.78 = 9,913.61/x
3. Step 3: Cross multiply
   12,146.40x = 16,769.78 × 9,913.61
4. Step 4: Simplify right side
   12,146.40x = 166,248,925.29
5. Step 5: Solve for x
   x = 166,248,925.29/12,146.40
6. Step 6: Final answer
   x = 13,687.09