Finding the Fourth Proportional to 259,105.48, 388,606.38 and 72,066.76

Step by Step Solution

1. Step 1: Write the proportion equation
   259,105.48 : 388,606.38 = 72,066.76 : x
2. Step 2: Convert to fraction form
   259,105.48/388,606.38 = 72,066.76/x
3. Step 3: Cross multiply
   259,105.48x = 388,606.38 × 72,066.76
4. Step 4: Simplify right side
   259,105.48x = 28,005,602,721.93
5. Step 5: Solve for x
   x = 28,005,602,721.93/259,105.48
6. Step 6: Final answer
   x = 108,085.72