Finding the Fourth Proportional to 78,105.39, 117,133.85 and 28,179.00

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.39 : 117,133.85 = 28,179.00 : x
2. Step 2: Convert to fraction form
   78,105.39/117,133.85 = 28,179.00/x
3. Step 3: Cross multiply
   78,105.39x = 117,133.85 × 28,179.00
4. Step 4: Simplify right side
   78,105.39x = 3,300,714,243.93
5. Step 5: Solve for x
   x = 3,300,714,243.93/78,105.39
6. Step 6: Final answer
   x = 42,259.75