Finding the Fourth Proportional to 172,578.42, 258,910.76 and 137,173.32

Step by Step Solution

1. Step 1: Write the proportion equation
   172,578.42 : 258,910.76 = 137,173.32 : x
2. Step 2: Convert to fraction form
   172,578.42/258,910.76 = 137,173.32/x
3. Step 3: Cross multiply
   172,578.42x = 258,910.76 × 137,173.32
4. Step 4: Simplify right side
   172,578.42x = 35,515,648,875.86
5. Step 5: Solve for x
   x = 35,515,648,875.86/172,578.42
6. Step 6: Final answer
   x = 205,794.26