Finding the Fourth Proportional to 11,818.06, 16,293.72 and 9,685.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,818.06 : 16,293.72 = 9,685.78 : x
2. Step 2: Convert to fraction form
   11,818.06/16,293.72 = 9,685.78/x
3. Step 3: Cross multiply
   11,818.06x = 16,293.72 × 9,685.78
4. Step 4: Simplify right side
   11,818.06x = 157,817,387.30
5. Step 5: Solve for x
   x = 157,817,387.30/11,818.06
6. Step 6: Final answer
   x = 13,353.92