Finding the Fourth Proportional to 428,895.76, 643,156.72 and 144,533.32

Step by Step Solution

1. Step 1: Write the proportion equation
   428,895.76 : 643,156.72 = 144,533.32 : x
2. Step 2: Convert to fraction form
   428,895.76/643,156.72 = 144,533.32/x
3. Step 3: Cross multiply
   428,895.76x = 643,156.72 × 144,533.32
4. Step 4: Simplify right side
   428,895.76x = 92,957,576,021.91
5. Step 5: Solve for x
   x = 92,957,576,021.91/428,895.76
6. Step 6: Final answer
   x = 216,736.99