Finding the Fourth Proportional to 12,448.89, 18,670.23 and 7,766.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,448.89 : 18,670.23 = 7,766.55 : x
2. Step 2: Convert to fraction form
   12,448.89/18,670.23 = 7,766.55/x
3. Step 3: Cross multiply
   12,448.89x = 18,670.23 × 7,766.55
4. Step 4: Simplify right side
   12,448.89x = 145,003,274.81
5. Step 5: Solve for x
   x = 145,003,274.81/12,448.89
6. Step 6: Final answer
   x = 11,647.89