Finding the Fourth Proportional to 397,196.82, 548,136.90 and 215,911.53

Step by Step Solution

1. Step 1: Write the proportion equation
   397,196.82 : 548,136.90 = 215,911.53 : x
2. Step 2: Convert to fraction form
   397,196.82/548,136.90 = 215,911.53/x
3. Step 3: Cross multiply
   397,196.82x = 548,136.90 × 215,911.53
4. Step 4: Simplify right side
   397,196.82x = 118,349,076,728.46
5. Step 5: Solve for x
   x = 118,349,076,728.46/397,196.82
6. Step 6: Final answer
   x = 297,960.79