Finding the Fourth Proportional to 388,874.42, 536,646.78 and 210,026.42

Step by Step Solution

1. Step 1: Write the proportion equation
   388,874.42 : 536,646.78 = 210,026.42 : x
2. Step 2: Convert to fraction form
   388,874.42/536,646.78 = 210,026.42/x
3. Step 3: Cross multiply
   388,874.42x = 536,646.78 × 210,026.42
4. Step 4: Simplify right side
   388,874.42x = 112,710,002,007.93
5. Step 5: Solve for x
   x = 112,710,002,007.93/388,874.42
6. Step 6: Final answer
   x = 289,836.50