Finding the Fourth Proportional to 78,717.78, 118,102.59 and 31,958.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,717.78 : 118,102.59 = 31,958.10 : x
2. Step 2: Convert to fraction form
   78,717.78/118,102.59 = 31,958.10/x
3. Step 3: Cross multiply
   78,717.78x = 118,102.59 × 31,958.10
4. Step 4: Simplify right side
   78,717.78x = 3,774,334,381.48
5. Step 5: Solve for x
   x = 3,774,334,381.48/78,717.78
6. Step 6: Final answer
   x = 47,947.67