Finding the Fourth Proportional to 78,718.78, 118,104.09 and 31,959.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,718.78 : 118,104.09 = 31,959.10 : x
2. Step 2: Convert to fraction form
   78,718.78/118,104.09 = 31,959.10/x
3. Step 3: Cross multiply
   78,718.78x = 118,104.09 × 31,959.10
4. Step 4: Simplify right side
   78,718.78x = 3,774,500,422.72
5. Step 5: Solve for x
   x = 3,774,500,422.72/78,718.78
6. Step 6: Final answer
   x = 47,949.17