Finding the Fourth Proportional to 388,808, 536,555.04 and 209,960

Step by Step Solution

1. Step 1: Write the proportion equation
   388,808 : 536,555.04 = 209,960 : x
2. Step 2: Convert to fraction form
   388,808/536,555.04 = 209,960/x
3. Step 3: Cross multiply
   388,808x = 536,555.04 × 209,960
4. Step 4: Simplify right side
   388,808x = 112,655,096,198.40
5. Step 5: Solve for x
   x = 112,655,096,198.40/388,808
6. Step 6: Final answer
   x = 289,744.80