Finding the Fourth Proportional to 78,105.12, 117,165.56 and 21,945.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.12 : 117,165.56 = 21,945.36 : x
2. Step 2: Convert to fraction form
   78,105.12/117,165.56 = 21,945.36/x
3. Step 3: Cross multiply
   78,105.12x = 117,165.56 × 21,945.36
4. Step 4: Simplify right side
   78,105.12x = 2,571,240,393.80
5. Step 5: Solve for x
   x = 2,571,240,393.80/78,105.12
6. Step 6: Final answer
   x = 32,920.25