Finding the Fourth Proportional to 561,951.78, 775,499.58 and 307,297.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,951.78 : 775,499.58 = 307,297.50 : x
2. Step 2: Convert to fraction form
   561,951.78/775,499.58 = 307,297.50/x
3. Step 3: Cross multiply
   561,951.78x = 775,499.58 × 307,297.50
4. Step 4: Simplify right side
   561,951.78x = 238,309,082,185.05
5. Step 5: Solve for x
   x = 238,309,082,185.05/561,951.78
6. Step 6: Final answer
   x = 424,073.90