Finding the Fourth Proportional to 359,858, 496,647.78 and 208,955

Step by Step Solution

1. Step 1: Write the proportion equation
   359,858 : 496,647.78 = 208,955 : x
2. Step 2: Convert to fraction form
   359,858/496,647.78 = 208,955/x
3. Step 3: Cross multiply
   359,858x = 496,647.78 × 208,955
4. Step 4: Simplify right side
   359,858x = 103,777,036,869.90
5. Step 5: Solve for x
   x = 103,777,036,869.90/359,858
6. Step 6: Final answer
   x = 288,383.30