Finding the Fourth Proportional to 172,918.86, 259,315.86 and 73,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   172,918.86 : 259,315.86 = 73,086.78 : x
2. Step 2: Convert to fraction form
   172,918.86/259,315.86 = 73,086.78/x
3. Step 3: Cross multiply
   172,918.86x = 259,315.86 × 73,086.78
4. Step 4: Simplify right side
   172,918.86x = 18,952,561,210.33
5. Step 5: Solve for x
   x = 18,952,561,210.33/172,918.86
6. Step 6: Final answer
   x = 109,603.78