Finding the Fourth Proportional to 288,940.50, 398,737.89 and 188,338.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,940.50 : 398,737.89 = 188,338.50 : x
2. Step 2: Convert to fraction form
   288,940.50/398,737.89 = 188,338.50/x
3. Step 3: Cross multiply
   288,940.50x = 398,737.89 × 188,338.50
4. Step 4: Simplify right side
   288,940.50x = 75,097,696,095.77
5. Step 5: Solve for x
   x = 75,097,696,095.77/288,940.50
6. Step 6: Final answer
   x = 259,907.13