Finding the Fourth Proportional to 57,640.78, 79,544.28 and 31,144.78

Step by Step Solution

1. Step 1: Write the proportion equation
   57,640.78 : 79,544.28 = 31,144.78 : x
2. Step 2: Convert to fraction form
   57,640.78/79,544.28 = 31,144.78/x
3. Step 3: Cross multiply
   57,640.78x = 79,544.28 × 31,144.78
4. Step 4: Simplify right side
   57,640.78x = 2,477,389,100.86
5. Step 5: Solve for x
   x = 2,477,389,100.86/57,640.78
6. Step 6: Final answer
   x = 42,979.80