Finding the Fourth Proportional to 388,945.50, 536,745.27 and 210,097.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,945.50 : 536,745.27 = 210,097.50 : x
2. Step 2: Convert to fraction form
   388,945.50/536,745.27 = 210,097.50/x
3. Step 3: Cross multiply
   388,945.50x = 536,745.27 × 210,097.50
4. Step 4: Simplify right side
   388,945.50x = 112,768,839,363.83
5. Step 5: Solve for x
   x = 112,768,839,363.83/388,945.50
6. Step 6: Final answer
   x = 289,934.81