Finding the Fourth Proportional to 805,108.78, 1,207,196.52 and 331,258.78

Step by Step Solution

1. Step 1: Write the proportion equation
   805,108.78 : 1,207,196.52 = 331,258.78 : x
2. Step 2: Convert to fraction form
   805,108.78/1,207,196.52 = 331,258.78/x
3. Step 3: Cross multiply
   805,108.78x = 1,207,196.52 × 331,258.78
4. Step 4: Simplify right side
   805,108.78x = 399,894,446,435.45
5. Step 5: Solve for x
   x = 399,894,446,435.45/805,108.78
6. Step 6: Final answer
   x = 496,696.17