Finding the Fourth Proportional to 12,998.98, 19,510.59 and 7,147.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,998.98 : 19,510.59 = 7,147.54 : x
2. Step 2: Convert to fraction form
   12,998.98/19,510.59 = 7,147.54/x
3. Step 3: Cross multiply
   12,998.98x = 19,510.59 × 7,147.54
4. Step 4: Simplify right side
   12,998.98x = 139,452,722.45
5. Step 5: Solve for x
   x = 139,452,722.45/12,998.98
6. Step 6: Final answer
   x = 10,727.97