Finding the Fourth Proportional to 10,665.66, 16,079.72 and 9,913.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,665.66 : 16,079.72 = 9,913.98 : x
2. Step 2: Convert to fraction form
   10,665.66/16,079.72 = 9,913.98/x
3. Step 3: Cross multiply
   10,665.66x = 16,079.72 × 9,913.98
4. Step 4: Simplify right side
   10,665.66x = 159,413,972.92
5. Step 5: Solve for x
   x = 159,413,972.92/10,665.66
6. Step 6: Final answer
   x = 14,946.47