Finding the Fourth Proportional to 665,300.72, 996,768.84 and 380,979.92

Step by Step Solution

1. Step 1: Write the proportion equation
   665,300.72 : 996,768.84 = 380,979.92 : x
2. Step 2: Convert to fraction form
   665,300.72/996,768.84 = 380,979.92/x
3. Step 3: Cross multiply
   665,300.72x = 996,768.84 × 380,979.92
4. Step 4: Simplify right side
   665,300.72x = 379,748,912,921.69
5. Step 5: Solve for x
   x = 379,748,912,921.69/665,300.72
6. Step 6: Final answer
   x = 570,792.88