Finding the Fourth Proportional to 213,640.72, 320,180.76 and 157,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   213,640.72 : 320,180.76 = 157,216.72 : x
2. Step 2: Convert to fraction form
   213,640.72/320,180.76 = 157,216.72/x
3. Step 3: Cross multiply
   213,640.72x = 320,180.76 × 157,216.72
4. Step 4: Simplify right side
   213,640.72x = 50,337,768,894.31
5. Step 5: Solve for x
   x = 50,337,768,894.31/213,640.72
6. Step 6: Final answer
   x = 235,618.79