Finding the Fourth Proportional to 78,451.82, 117,640.77 and 28,496.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,451.82 : 117,640.77 = 28,496.69 : x
2. Step 2: Convert to fraction form
   78,451.82/117,640.77 = 28,496.69/x
3. Step 3: Cross multiply
   78,451.82x = 117,640.77 × 28,496.69
4. Step 4: Simplify right side
   78,451.82x = 3,352,372,554.05
5. Step 5: Solve for x
   x = 3,352,372,554.05/78,451.82
6. Step 6: Final answer
   x = 42,731.61