Finding the Fourth Proportional to 78,679.05, 118,067.78 and 31,931.93

Step by Step Solution

1. Step 1: Write the proportion equation
   78,679.05 : 118,067.78 = 31,931.93 : x
2. Step 2: Convert to fraction form
   78,679.05/118,067.78 = 31,931.93/x
3. Step 3: Cross multiply
   78,679.05x = 118,067.78 × 31,931.93
4. Step 4: Simplify right side
   78,679.05x = 3,770,131,575.71
5. Step 5: Solve for x
   x = 3,770,131,575.71/78,679.05
6. Step 6: Final answer
   x = 47,917.86