Finding the Fourth Proportional to 21,857.58, 32,778.32 and 7,813.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,857.58 : 32,778.32 = 7,813.82 : x
2. Step 2: Convert to fraction form
   21,857.58/32,778.32 = 7,813.82/x
3. Step 3: Cross multiply
   21,857.58x = 32,778.32 × 7,813.82
4. Step 4: Simplify right side
   21,857.58x = 256,123,892.38
5. Step 5: Solve for x
   x = 256,123,892.38/21,857.58
6. Step 6: Final answer
   x = 11,717.85