Finding the Fourth Proportional to 321,561.86, 443,956.01 and 207,039.06

Step by Step Solution

1. Step 1: Write the proportion equation
   321,561.86 : 443,956.01 = 207,039.06 : x
2. Step 2: Convert to fraction form
   321,561.86/443,956.01 = 207,039.06/x
3. Step 3: Cross multiply
   321,561.86x = 443,956.01 × 207,039.06
4. Step 4: Simplify right side
   321,561.86x = 91,916,233,956.56
5. Step 5: Solve for x
   x = 91,916,233,956.56/321,561.86
6. Step 6: Final answer
   x = 285,843.09