Finding the Fourth Proportional to 11,978.98, 16,525.39 and 7,728.94

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.98 : 16,525.39 = 7,728.94 : x
2. Step 2: Convert to fraction form
   11,978.98/16,525.39 = 7,728.94/x
3. Step 3: Cross multiply
   11,978.98x = 16,525.39 × 7,728.94
4. Step 4: Simplify right side
   11,978.98x = 127,723,747.79
5. Step 5: Solve for x
   x = 127,723,747.79/11,978.98
6. Step 6: Final answer
   x = 10,662.32