Finding the Fourth Proportional to 21,815.45, 32,726.82 and 7,783.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,815.45 : 32,726.82 = 7,783.57 : x
2. Step 2: Convert to fraction form
   21,815.45/32,726.82 = 7,783.57/x
3. Step 3: Cross multiply
   21,815.45x = 32,726.82 × 7,783.57
4. Step 4: Simplify right side
   21,815.45x = 254,731,412.53
5. Step 5: Solve for x
   x = 254,731,412.53/21,815.45
6. Step 6: Final answer
   x = 11,676.65