Finding the Fourth Proportional to 388,897, 536,678.22 and 210,049

Step by Step Solution

1. Step 1: Write the proportion equation
   388,897 : 536,678.22 = 210,049 : x
2. Step 2: Convert to fraction form
   388,897/536,678.22 = 210,049/x
3. Step 3: Cross multiply
   388,897x = 536,678.22 × 210,049
4. Step 4: Simplify right side
   388,897x = 112,728,723,432.78
5. Step 5: Solve for x
   x = 112,728,723,432.78/388,897
6. Step 6: Final answer
   x = 289,867.81