Finding the Fourth Proportional to 331,066.72, 456,817.57 and 208,540.05

Step by Step Solution

1. Step 1: Write the proportion equation
   331,066.72 : 456,817.57 = 208,540.05 : x
2. Step 2: Convert to fraction form
   331,066.72/456,817.57 = 208,540.05/x
3. Step 3: Cross multiply
   331,066.72x = 456,817.57 × 208,540.05
4. Step 4: Simplify right side
   331,066.72x = 95,264,758,888.68
5. Step 5: Solve for x
   x = 95,264,758,888.68/331,066.72
6. Step 6: Final answer
   x = 287,750.94