Finding the Fourth Proportional to 428,271.82, 642,208.29 and 191,616.46

Step by Step Solution

1. Step 1: Write the proportion equation
   428,271.82 : 642,208.29 = 191,616.46 : x
2. Step 2: Convert to fraction form
   428,271.82/642,208.29 = 191,616.46/x
3. Step 3: Cross multiply
   428,271.82x = 642,208.29 × 191,616.46
4. Step 4: Simplify right side
   428,271.82x = 123,057,679,112.45
5. Step 5: Solve for x
   x = 123,057,679,112.45/428,271.82
6. Step 6: Final answer
   x = 287,335.46