Finding the Fourth Proportional to 11,687.25, 16,121.91 and 7,648.47

Step by Step Solution

1. Step 1: Write the proportion equation
   11,687.25 : 16,121.91 = 7,648.47 : x
2. Step 2: Convert to fraction form
   11,687.25/16,121.91 = 7,648.47/x
3. Step 3: Cross multiply
   11,687.25x = 16,121.91 × 7,648.47
4. Step 4: Simplify right side
   11,687.25x = 123,307,944.98
5. Step 5: Solve for x
   x = 123,307,944.98/11,687.25
6. Step 6: Final answer
   x = 10,550.64