Finding the Fourth Proportional to 300,906.72, 415,293.80 and 186,222.31

Step by Step Solution

1. Step 1: Write the proportion equation
   300,906.72 : 415,293.80 = 186,222.31 : x
2. Step 2: Convert to fraction form
   300,906.72/415,293.80 = 186,222.31/x
3. Step 3: Cross multiply
   300,906.72x = 415,293.80 × 186,222.31
4. Step 4: Simplify right side
   300,906.72x = 77,336,968,795.33
5. Step 5: Solve for x
   x = 77,336,968,795.33/300,906.72
6. Step 6: Final answer
   x = 257,013.10