Finding the Fourth Proportional to 686,065.86, 1,029,198.42 and 212,789.34

Step by Step Solution

1. Step 1: Write the proportion equation
   686,065.86 : 1,029,198.42 = 212,789.34 : x
2. Step 2: Convert to fraction form
   686,065.86/1,029,198.42 = 212,789.34/x
3. Step 3: Cross multiply
   686,065.86x = 1,029,198.42 × 212,789.34
4. Step 4: Simplify right side
   686,065.86x = 219,002,452,520.84
5. Step 5: Solve for x
   x = 219,002,452,520.84/686,065.86
6. Step 6: Final answer
   x = 319,214.91