Finding the Fourth Proportional to 309,111.30, 426,578.13 and 188,258.22

Step by Step Solution

1. Step 1: Write the proportion equation
   309,111.30 : 426,578.13 = 188,258.22 : x
2. Step 2: Convert to fraction form
   309,111.30/426,578.13 = 188,258.22/x
3. Step 3: Cross multiply
   309,111.30x = 426,578.13 × 188,258.22
4. Step 4: Simplify right side
   309,111.30x = 80,306,839,444.73
5. Step 5: Solve for x
   x = 80,306,839,444.73/309,111.30
6. Step 6: Final answer
   x = 259,799.11