Finding the Fourth Proportional to 12,699.98, 19,043.69 and 7,436.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,699.98 : 19,043.69 = 7,436.31 : x
2. Step 2: Convert to fraction form
   12,699.98/19,043.69 = 7,436.31/x
3. Step 3: Cross multiply
   12,699.98x = 19,043.69 × 7,436.31
4. Step 4: Simplify right side
   12,699.98x = 141,614,745.20
5. Step 5: Solve for x
   x = 141,614,745.20/12,699.98
6. Step 6: Final answer
   x = 11,150.79