Finding the Fourth Proportional to 259,488.50, 389,297.54 and 72,498.38

Step by Step Solution

1. Step 1: Write the proportion equation
   259,488.50 : 389,297.54 = 72,498.38 : x
2. Step 2: Convert to fraction form
   259,488.50/389,297.54 = 72,498.38/x
3. Step 3: Cross multiply
   259,488.50x = 389,297.54 × 72,498.38
4. Step 4: Simplify right side
   259,488.50x = 28,223,439,222.74
5. Step 5: Solve for x
   x = 28,223,439,222.74/259,488.50
6. Step 6: Final answer
   x = 108,765.67