Finding the Fourth Proportional to 139,729.58, 192,826.25 and 78,467.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,729.58 : 192,826.25 = 78,467.25 : x
2. Step 2: Convert to fraction form
   139,729.58/192,826.25 = 78,467.25/x
3. Step 3: Cross multiply
   139,729.58x = 192,826.25 × 78,467.25
4. Step 4: Simplify right side
   139,729.58x = 15,130,545,172.98
5. Step 5: Solve for x
   x = 15,130,545,172.98/139,729.58
6. Step 6: Final answer
   x = 108,284.49