Finding the Fourth Proportional to 78,105.69, 117,134.33 and 28,179.29

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.69 : 117,134.33 = 28,179.29 : x
2. Step 2: Convert to fraction form
   78,105.69/117,134.33 = 28,179.29/x
3. Step 3: Cross multiply
   78,105.69x = 117,134.33 × 28,179.29
4. Step 4: Simplify right side
   78,105.69x = 3,300,762,405.97
5. Step 5: Solve for x
   x = 3,300,762,405.97/78,105.69
6. Step 6: Final answer
   x = 42,260.20