Finding the Fourth Proportional to 258,630.72, 387,933.60 and 90,144.24

Step by Step Solution

1. Step 1: Write the proportion equation
   258,630.72 : 387,933.60 = 90,144.24 : x
2. Step 2: Convert to fraction form
   258,630.72/387,933.60 = 90,144.24/x
3. Step 3: Cross multiply
   258,630.72x = 387,933.60 × 90,144.24
4. Step 4: Simplify right side
   258,630.72x = 34,969,979,542.46
5. Step 5: Solve for x
   x = 34,969,979,542.46/258,630.72
6. Step 6: Final answer
   x = 135,212.01