Finding the Fourth Proportional to 388,945.57, 536,744.90 and 210,097.57

Step by Step Solution

1. Step 1: Write the proportion equation
   388,945.57 : 536,744.90 = 210,097.57 : x
2. Step 2: Convert to fraction form
   388,945.57/536,744.90 = 210,097.57/x
3. Step 3: Cross multiply
   388,945.57x = 536,744.90 × 210,097.57
4. Step 4: Simplify right side
   388,945.57x = 112,768,799,199.89
5. Step 5: Solve for x
   x = 112,768,799,199.89/388,945.57
6. Step 6: Final answer
   x = 289,934.65