Finding the Fourth Proportional to 78,104.71, 117,132.84 and 28,178.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,104.71 : 117,132.84 = 28,178.31 : x
2. Step 2: Convert to fraction form
   78,104.71/117,132.84 = 28,178.31/x
3. Step 3: Cross multiply
   78,104.71x = 117,132.84 × 28,178.31
4. Step 4: Simplify right side
   78,104.71x = 3,300,605,995.20
5. Step 5: Solve for x
   x = 3,300,605,995.20/78,104.71
6. Step 6: Final answer
   x = 42,258.73