Finding the Fourth Proportional to 21,707.72, 32,571.71 and 7,678.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,707.72 : 32,571.71 = 7,678.37 : x
2. Step 2: Convert to fraction form
   21,707.72/32,571.71 = 7,678.37/x
3. Step 3: Cross multiply
   21,707.72x = 32,571.71 × 7,678.37
4. Step 4: Simplify right side
   21,707.72x = 250,097,439.66
5. Step 5: Solve for x
   x = 250,097,439.66/21,707.72
6. Step 6: Final answer
   x = 11,521.13