Finding the Fourth Proportional to 428,404.32, 642,661.38 and 143,972.82

Step by Step Solution

1. Step 1: Write the proportion equation
   428,404.32 : 642,661.38 = 143,972.82 : x
2. Step 2: Convert to fraction form
   428,404.32/642,661.38 = 143,972.82/x
3. Step 3: Cross multiply
   428,404.32x = 642,661.38 × 143,972.82
4. Step 4: Simplify right side
   428,404.32x = 92,525,771,183.69
5. Step 5: Solve for x
   x = 92,525,771,183.69/428,404.32
6. Step 6: Final answer
   x = 215,977.68