Finding the Fourth Proportional to 12,139.29, 18,200.02 and 5,119.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,139.29 : 18,200.02 = 5,119.02 : x
2. Step 2: Convert to fraction form
   12,139.29/18,200.02 = 5,119.02/x
3. Step 3: Cross multiply
   12,139.29x = 18,200.02 × 5,119.02
4. Step 4: Simplify right side
   12,139.29x = 93,166,266.38
5. Step 5: Solve for x
   x = 93,166,266.38/12,139.29
6. Step 6: Final answer
   x = 7,674.77