Finding the Fourth Proportional to 78,618.60, 117,976.50 and 31,871.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78,618.60 : 117,976.50 = 31,871.88 : x
2. Step 2: Convert to fraction form
   78,618.60/117,976.50 = 31,871.88/x
3. Step 3: Cross multiply
   78,618.60x = 117,976.50 × 31,871.88
4. Step 4: Simplify right side
   78,618.60x = 3,760,132,850.82
5. Step 5: Solve for x
   x = 3,760,132,850.82/78,618.60
6. Step 6: Final answer
   x = 47,827.52