Finding the Fourth Proportional to 21,225.78, 31,836.83 and 7,185.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,225.78 : 31,836.83 = 7,185.50 : x
2. Step 2: Convert to fraction form
   21,225.78/31,836.83 = 7,185.50/x
3. Step 3: Cross multiply
   21,225.78x = 31,836.83 × 7,185.50
4. Step 4: Simplify right side
   21,225.78x = 228,763,466.24
5. Step 5: Solve for x
   x = 228,763,466.24/21,225.78
6. Step 6: Final answer
   x = 10,777.62