Finding the Fourth Proportional to 259,238.39, 388,855.76 and 72,249.89

Step by Step Solution

1. Step 1: Write the proportion equation
   259,238.39 : 388,855.76 = 72,249.89 : x
2. Step 2: Convert to fraction form
   259,238.39/388,855.76 = 72,249.89/x
3. Step 3: Cross multiply
   259,238.39x = 388,855.76 × 72,249.89
4. Step 4: Simplify right side
   259,238.39x = 28,094,783,580.34
5. Step 5: Solve for x
   x = 28,094,783,580.34/259,238.39
6. Step 6: Final answer
   x = 108,374.32