Finding the Fourth Proportional to 287,845.30, 431,379.15 and 192,805.30

Step by Step Solution

1. Step 1: Write the proportion equation
   287,845.30 : 431,379.15 = 192,805.30 : x
2. Step 2: Convert to fraction form
   287,845.30/431,379.15 = 192,805.30/x
3. Step 3: Cross multiply
   287,845.30x = 431,379.15 × 192,805.30
4. Step 4: Simplify right side
   287,845.30x = 83,172,186,429.50
5. Step 5: Solve for x
   x = 83,172,186,429.50/287,845.30
6. Step 6: Final answer
   x = 288,947.52