Finding the Fourth Proportional to 321,256.38, 443,535.32 and 206,734.01

Step by Step Solution

1. Step 1: Write the proportion equation
   321,256.38 : 443,535.32 = 206,734.01 : x
2. Step 2: Convert to fraction form
   321,256.38/443,535.32 = 206,734.01/x
3. Step 3: Cross multiply
   321,256.38x = 443,535.32 × 206,734.01
4. Step 4: Simplify right side
   321,256.38x = 91,693,832,997.95
5. Step 5: Solve for x
   x = 91,693,832,997.95/321,256.38
6. Step 6: Final answer
   x = 285,422.61