Finding the Fourth Proportional to 21,783.69, 32,623.70 and 12,530.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,783.69 : 32,623.70 = 12,530.25 : x
2. Step 2: Convert to fraction form
   21,783.69/32,623.70 = 12,530.25/x
3. Step 3: Cross multiply
   21,783.69x = 32,623.70 × 12,530.25
4. Step 4: Simplify right side
   21,783.69x = 408,783,054.27
5. Step 5: Solve for x
   x = 408,783,054.27/21,783.69
6. Step 6: Final answer
   x = 18,765.56