Finding the Fourth Proportional to 171,978.80, 257,530.80 and 164,105.60

Step by Step Solution

1. Step 1: Write the proportion equation
   171,978.80 : 257,530.80 = 164,105.60 : x
2. Step 2: Convert to fraction form
   171,978.80/257,530.80 = 164,105.60/x
3. Step 3: Cross multiply
   171,978.80x = 257,530.80 × 164,105.60
4. Step 4: Simplify right side
   171,978.80x = 42,262,246,452.48
5. Step 5: Solve for x
   x = 42,262,246,452.48/171,978.80
6. Step 6: Final answer
   x = 245,741.02