Finding the Fourth Proportional to 257,213.22, 355,077.32 and 171,315.15

Step by Step Solution

1. Step 1: Write the proportion equation
   257,213.22 : 355,077.32 = 171,315.15 : x
2. Step 2: Convert to fraction form
   257,213.22/355,077.32 = 171,315.15/x
3. Step 3: Cross multiply
   257,213.22x = 355,077.32 × 171,315.15
4. Step 4: Simplify right side
   257,213.22x = 60,830,123,480.82
5. Step 5: Solve for x
   x = 60,830,123,480.82/257,213.22
6. Step 6: Final answer
   x = 236,496.88