Finding the Fourth Proportional to 686,109, 946,816.28 and 380,182.72

Step by Step Solution

1. Step 1: Write the proportion equation
   686,109 : 946,816.28 = 380,182.72 : x
2. Step 2: Convert to fraction form
   686,109/946,816.28 = 380,182.72/x
3. Step 3: Cross multiply
   686,109x = 946,816.28 × 380,182.72
4. Step 4: Simplify right side
   686,109x = 359,963,188,670.68
5. Step 5: Solve for x
   x = 359,963,188,670.68/686,109
6. Step 6: Final answer
   x = 524,644.32