Finding the Fourth Proportional to 78,131.49, 117,149.99 and 30,689.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,131.49 : 117,149.99 = 30,689.79 : x
2. Step 2: Convert to fraction form
   78,131.49/117,149.99 = 30,689.79/x
3. Step 3: Cross multiply
   78,131.49x = 117,149.99 × 30,689.79
4. Step 4: Simplify right side
   78,131.49x = 3,595,308,438.15
5. Step 5: Solve for x
   x = 3,595,308,438.15/78,131.49
6. Step 6: Final answer
   x = 46,016.13