Finding the Fourth Proportional to 78,877.36, 108,665.76 and 54,960.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,877.36 : 108,665.76 = 54,960.64 : x
2. Step 2: Convert to fraction form
   78,877.36/108,665.76 = 54,960.64/x
3. Step 3: Cross multiply
   78,877.36x = 108,665.76 × 54,960.64
4. Step 4: Simplify right side
   78,877.36x = 5,972,339,715.69
5. Step 5: Solve for x
   x = 5,972,339,715.69/78,877.36
6. Step 6: Final answer
   x = 75,716.78