Finding the Fourth Proportional to 388,834.88, 536,592.15 and 209,986.88

Step by Step Solution

1. Step 1: Write the proportion equation
   388,834.88 : 536,592.15 = 209,986.88 : x
2. Step 2: Convert to fraction form
   388,834.88/536,592.15 = 209,986.88/x
3. Step 3: Cross multiply
   388,834.88x = 536,592.15 × 209,986.88
4. Step 4: Simplify right side
   388,834.88x = 112,677,308,728.03
5. Step 5: Solve for x
   x = 112,677,308,728.03/388,834.88
6. Step 6: Final answer
   x = 289,781.90