Finding the Fourth Proportional to 13,146.78, 18,144.90 and 7,768.99

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.78 : 18,144.90 = 7,768.99 : x
2. Step 2: Convert to fraction form
   13,146.78/18,144.90 = 7,768.99/x
3. Step 3: Cross multiply
   13,146.78x = 18,144.90 × 7,768.99
4. Step 4: Simplify right side
   13,146.78x = 140,967,569.33
5. Step 5: Solve for x
   x = 140,967,569.33/13,146.78
6. Step 6: Final answer
   x = 10,722.59