Finding the Fourth Proportional to 171,728, 236,904 and 121,454.72

Step by Step Solution

1. Step 1: Write the proportion equation
   171,728 : 236,904 = 121,454.72 : x
2. Step 2: Convert to fraction form
   171,728/236,904 = 121,454.72/x
3. Step 3: Cross multiply
   171,728x = 236,904 × 121,454.72
4. Step 4: Simplify right side
   171,728x = 28,773,108,986.88
5. Step 5: Solve for x
   x = 28,773,108,986.88/171,728
6. Step 6: Final answer
   x = 167,550.48