Finding the Fourth Proportional to 12,996.18, 19,495.71 and 7,149.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,996.18 : 19,495.71 = 7,149.78 : x
2. Step 2: Convert to fraction form
   12,996.18/19,495.71 = 7,149.78/x
3. Step 3: Cross multiply
   12,996.18x = 19,495.71 × 7,149.78
4. Step 4: Simplify right side
   12,996.18x = 139,390,037.44
5. Step 5: Solve for x
   x = 139,390,037.44/12,996.18
6. Step 6: Final answer
   x = 10,725.46