Finding the Fourth Proportional to 388,850.50, 536,613.69 and 210,002.50

Step by Step Solution

1. Step 1: Write the proportion equation
   388,850.50 : 536,613.69 = 210,002.50 : x
2. Step 2: Convert to fraction form
   388,850.50/536,613.69 = 210,002.50/x
3. Step 3: Cross multiply
   388,850.50x = 536,613.69 × 210,002.50
4. Step 4: Simplify right side
   388,850.50x = 112,690,216,434.23
5. Step 5: Solve for x
   x = 112,690,216,434.23/388,850.50
6. Step 6: Final answer
   x = 289,803.45