Finding the Fourth Proportional to 456,819.89, 685,369.98 and 204,312.78

Step by Step Solution

1. Step 1: Write the proportion equation
   456,819.89 : 685,369.98 = 204,312.78 : x
2. Step 2: Convert to fraction form
   456,819.89/685,369.98 = 204,312.78/x
3. Step 3: Cross multiply
   456,819.89x = 685,369.98 × 204,312.78
4. Step 4: Simplify right side
   456,819.89x = 140,029,845,942.34
5. Step 5: Solve for x
   x = 140,029,845,942.34/456,819.89
6. Step 6: Final answer
   x = 306,531.85