Finding the Fourth Proportional to 309,738.72, 464,893.20 and 191,640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   309,738.72 : 464,893.20 = 191,640.72 : x
2. Step 2: Convert to fraction form
   309,738.72/464,893.20 = 191,640.72/x
3. Step 3: Cross multiply
   309,738.72x = 464,893.20 × 191,640.72
4. Step 4: Simplify right side
   309,738.72x = 89,092,467,571.10
5. Step 5: Solve for x
   x = 89,092,467,571.10/309,738.72
6. Step 6: Final answer
   x = 287,637.49