Finding the Fourth Proportional to 139,546.19, 192,589.98 and 78,309.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,546.19 : 192,589.98 = 78,309.25 : x
2. Step 2: Convert to fraction form
   139,546.19/192,589.98 = 78,309.25/x
3. Step 3: Cross multiply
   139,546.19x = 192,589.98 × 78,309.25
4. Step 4: Simplify right side
   139,546.19x = 15,081,576,891.32
5. Step 5: Solve for x
   x = 15,081,576,891.32/139,546.19
6. Step 6: Final answer
   x = 108,075.88