Finding the Fourth Proportional to 12,993.80, 19,457.49 and 7,143.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,993.80 : 19,457.49 = 7,143.98 : x
2. Step 2: Convert to fraction form
   12,993.80/19,457.49 = 7,143.98/x
3. Step 3: Cross multiply
   12,993.80x = 19,457.49 × 7,143.98
4. Step 4: Simplify right side
   12,993.80x = 139,003,919.41
5. Step 5: Solve for x
   x = 139,003,919.41/12,993.80
6. Step 6: Final answer
   x = 10,697.71