Finding the Fourth Proportional to 501,123, 691,872.30 and 447,315.96

Step by Step Solution

1. Step 1: Write the proportion equation
   501,123 : 691,872.30 = 447,315.96 : x
2. Step 2: Convert to fraction form
   501,123/691,872.30 = 447,315.96/x
3. Step 3: Cross multiply
   501,123x = 691,872.30 × 447,315.96
4. Step 4: Simplify right side
   501,123x = 309,485,522,071.91
5. Step 5: Solve for x
   x = 309,485,522,071.91/501,123
6. Step 6: Final answer
   x = 617,583.95