Finding the Fourth Proportional to 21,728.16, 32,594.82 and 7,685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,728.16 : 32,594.82 = 7,685.31 : x
2. Step 2: Convert to fraction form
   21,728.16/32,594.82 = 7,685.31/x
3. Step 3: Cross multiply
   21,728.16x = 32,594.82 × 7,685.31
4. Step 4: Simplify right side
   21,728.16x = 250,501,296.09
5. Step 5: Solve for x
   x = 250,501,296.09/21,728.16
6. Step 6: Final answer
   x = 11,528.88