Finding the Fourth Proportional to 209,424.91, 311,768.72 and 208,179.37

Step by Step Solution

1. Step 1: Write the proportion equation
   209,424.91 : 311,768.72 = 208,179.37 : x
2. Step 2: Convert to fraction form
   209,424.91/311,768.72 = 208,179.37/x
3. Step 3: Cross multiply
   209,424.91x = 311,768.72 × 208,179.37
4. Step 4: Simplify right side
   209,424.91x = 64,903,815,715.31
5. Step 5: Solve for x
   x = 64,903,815,715.31/209,424.91
6. Step 6: Final answer
   x = 309,914.50