Finding the Fourth Proportional to 443,529.62, 665,054.72 and 139,866.49

Step by Step Solution

1. Step 1: Write the proportion equation
   443,529.62 : 665,054.72 = 139,866.49 : x
2. Step 2: Convert to fraction form
   443,529.62/665,054.72 = 139,866.49/x
3. Step 3: Cross multiply
   443,529.62x = 665,054.72 × 139,866.49
4. Step 4: Simplify right side
   443,529.62x = 93,018,870,000.82
5. Step 5: Solve for x
   x = 93,018,870,000.82/443,529.62
6. Step 6: Final answer
   x = 209,724.14