Finding the Fourth Proportional to 78,105.71, 117,134.34 and 28,179.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.71 : 117,134.34 = 28,179.31 : x
2. Step 2: Convert to fraction form
   78,105.71/117,134.34 = 28,179.31/x
3. Step 3: Cross multiply
   78,105.71x = 117,134.34 × 28,179.31
4. Step 4: Simplify right side
   78,105.71x = 3,300,764,878.51
5. Step 5: Solve for x
   x = 3,300,764,878.51/78,105.71
6. Step 6: Final answer
   x = 42,260.23