Finding the Fourth Proportional to 78,689.78, 118,046.94 and 31,945.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,689.78 : 118,046.94 = 31,945.94 : x
2. Step 2: Convert to fraction form
   78,689.78/118,046.94 = 31,945.94/x
3. Step 3: Cross multiply
   78,689.78x = 118,046.94 × 31,945.94
4. Step 4: Simplify right side
   78,689.78x = 3,771,120,462.42
5. Step 5: Solve for x
   x = 3,771,120,462.42/78,689.78
6. Step 6: Final answer
   x = 47,923.89