Finding the Fourth Proportional to 12,179.71, 16,806.20 and 7,142.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,179.71 : 16,806.20 = 7,142.03 : x
2. Step 2: Convert to fraction form
   12,179.71/16,806.20 = 7,142.03/x
3. Step 3: Cross multiply
   12,179.71x = 16,806.20 × 7,142.03
4. Step 4: Simplify right side
   12,179.71x = 120,030,384.59
5. Step 5: Solve for x
   x = 120,030,384.59/12,179.71
6. Step 6: Final answer
   x = 9,854.95