Finding the Fourth Proportional to 308,912.69, 426,339.72 and 172,998.54

Step by Step Solution

1. Step 1: Write the proportion equation
   308,912.69 : 426,339.72 = 172,998.54 : x
2. Step 2: Convert to fraction form
   308,912.69/426,339.72 = 172,998.54/x
3. Step 3: Cross multiply
   308,912.69x = 426,339.72 × 172,998.54
4. Step 4: Simplify right side
   308,912.69x = 73,756,149,104.01
5. Step 5: Solve for x
   x = 73,756,149,104.01/308,912.69
6. Step 6: Final answer
   x = 238,760.50