Finding the Fourth Proportional to 428,162.16, 642,333.36 and 161,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   428,162.16 : 642,333.36 = 161,916.72 : x
2. Step 2: Convert to fraction form
   428,162.16/642,333.36 = 161,916.72/x
3. Step 3: Cross multiply
   428,162.16x = 642,333.36 × 161,916.72
4. Step 4: Simplify right side
   428,162.16x = 104,004,510,797.78
5. Step 5: Solve for x
   x = 104,004,510,797.78/428,162.16
6. Step 6: Final answer
   x = 242,909.16