Finding the Fourth Proportional to 686,139.72, 1,028,792.83 and 306,989.85

Step by Step Solution

1. Step 1: Write the proportion equation
   686,139.72 : 1,028,792.83 = 306,989.85 : x
2. Step 2: Convert to fraction form
   686,139.72/1,028,792.83 = 306,989.85/x
3. Step 3: Cross multiply
   686,139.72x = 1,028,792.83 × 306,989.85
4. Step 4: Simplify right side
   686,139.72x = 315,828,956,562.78
5. Step 5: Solve for x
   x = 315,828,956,562.78/686,139.72
6. Step 6: Final answer
   x = 460,298.31