Finding the Fourth Proportional to 386,238.27, 579,517.38 and 208,536.42

Step by Step Solution

1. Step 1: Write the proportion equation
   386,238.27 : 579,517.38 = 208,536.42 : x
2. Step 2: Convert to fraction form
   386,238.27/579,517.38 = 208,536.42/x
3. Step 3: Cross multiply
   386,238.27x = 579,517.38 × 208,536.42
4. Step 4: Simplify right side
   386,238.27x = 120,850,479,752.98
5. Step 5: Solve for x
   x = 120,850,479,752.98/386,238.27
6. Step 6: Final answer
   x = 312,891.00