Finding the Fourth Proportional to 8,923.78, 12,315.28 and 4,945.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,923.78 : 12,315.28 = 4,945.34 : x
2. Step 2: Convert to fraction form
   8,923.78/12,315.28 = 4,945.34/x
3. Step 3: Cross multiply
   8,923.78x = 12,315.28 × 4,945.34
4. Step 4: Simplify right side
   8,923.78x = 60,903,246.80
5. Step 5: Solve for x
   x = 60,903,246.80/8,923.78
6. Step 6: Final answer
   x = 6,824.83