Finding the Fourth Proportional to 172,740.42, 259,145.46 and 72,900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   172,740.42 : 259,145.46 = 72,900.72 : x
2. Step 2: Convert to fraction form
   172,740.42/259,145.46 = 72,900.72/x
3. Step 3: Cross multiply
   172,740.42x = 259,145.46 × 72,900.72
4. Step 4: Simplify right side
   172,740.42x = 18,891,890,618.73
5. Step 5: Solve for x
   x = 18,891,890,618.73/172,740.42
6. Step 6: Final answer
   x = 109,365.78