Finding the Fourth Proportional to 78,112.20, 117,144.08 and 28,185.82

Step by Step Solution

1. Step 1: Write the proportion equation
   78,112.20 : 117,144.08 = 28,185.82 : x
2. Step 2: Convert to fraction form
   78,112.20/117,144.08 = 28,185.82/x
3. Step 3: Cross multiply
   78,112.20x = 117,144.08 × 28,185.82
4. Step 4: Simplify right side
   78,112.20x = 3,301,801,952.95
5. Step 5: Solve for x
   x = 3,301,801,952.95/78,112.20
6. Step 6: Final answer
   x = 42,269.99