Finding the Fourth Proportional to 443,816.10, 665,724.15 and 443,816.10

Step by Step Solution

1. Step 1: Write the proportion equation
   443,816.10 : 665,724.15 = 443,816.10 : x
2. Step 2: Convert to fraction form
   443,816.10/665,724.15 = 443,816.10/x
3. Step 3: Cross multiply
   443,816.10x = 665,724.15 × 443,816.10
4. Step 4: Simplify right side
   443,816.10x = 295,459,095,928.82
5. Step 5: Solve for x
   x = 295,459,095,928.82/443,816.10
6. Step 6: Final answer
   x = 665,724.15