Finding the Fourth Proportional to 12,111.40, 16,666.50 and 10,717.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.40 : 16,666.50 = 10,717.48 : x
2. Step 2: Convert to fraction form
   12,111.40/16,666.50 = 10,717.48/x
3. Step 3: Cross multiply
   12,111.40x = 16,666.50 × 10,717.48
4. Step 4: Simplify right side
   12,111.40x = 178,622,880.42
5. Step 5: Solve for x
   x = 178,622,880.42/12,111.40
6. Step 6: Final answer
   x = 14,748.33