Finding the Fourth Proportional to 78,689.69, 118,028.15 and 31,302.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,689.69 : 118,028.15 = 31,302.87 : x
2. Step 2: Convert to fraction form
   78,689.69/118,028.15 = 31,302.87/x
3. Step 3: Cross multiply
   78,689.69x = 118,028.15 × 31,302.87
4. Step 4: Simplify right side
   78,689.69x = 3,694,619,835.79
5. Step 5: Solve for x
   x = 3,694,619,835.79/78,689.69
6. Step 6: Final answer
   x = 46,951.77