Finding the Fourth Proportional to 12,623.21, 18,913.89 and 7,677.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,623.21 : 18,913.89 = 7,677.89 : x
2. Step 2: Convert to fraction form
   12,623.21/18,913.89 = 7,677.89/x
3. Step 3: Cross multiply
   12,623.21x = 18,913.89 × 7,677.89
4. Step 4: Simplify right side
   12,623.21x = 145,218,766.89
5. Step 5: Solve for x
   x = 145,218,766.89/12,623.21
6. Step 6: Final answer
   x = 11,504.11