Finding the Fourth Proportional to 172,118.37, 258,278.61 and 72,270.89

Step by Step Solution

1. Step 1: Write the proportion equation
   172,118.37 : 258,278.61 = 72,270.89 : x
2. Step 2: Convert to fraction form
   172,118.37/258,278.61 = 72,270.89/x
3. Step 3: Cross multiply
   172,118.37x = 258,278.61 × 72,270.89
4. Step 4: Simplify right side
   172,118.37x = 18,666,025,012.66
5. Step 5: Solve for x
   x = 18,666,025,012.66/172,118.37
6. Step 6: Final answer
   x = 108,448.77