Finding the Fourth Proportional to 521,942.10, 729,144.30 and 521,942.10

Step by Step Solution

1. Step 1: Write the proportion equation
   521,942.10 : 729,144.30 = 521,942.10 : x
2. Step 2: Convert to fraction form
   521,942.10/729,144.30 = 521,942.10/x
3. Step 3: Cross multiply
   521,942.10x = 729,144.30 × 521,942.10
4. Step 4: Simplify right side
   521,942.10x = 380,571,107,145.03
5. Step 5: Solve for x
   x = 380,571,107,145.03/521,942.10
6. Step 6: Final answer
   x = 729,144.30