Finding the Fourth Proportional to 764,443.72, 1,054,932.96 and 420,285.48

Step by Step Solution

1. Step 1: Write the proportion equation
   764,443.72 : 1,054,932.96 = 420,285.48 : x
2. Step 2: Convert to fraction form
   764,443.72/1,054,932.96 = 420,285.48/x
3. Step 3: Cross multiply
   764,443.72x = 1,054,932.96 × 420,285.48
4. Step 4: Simplify right side
   764,443.72x = 443,373,005,461.42
5. Step 5: Solve for x
   x = 443,373,005,461.42/764,443.72
6. Step 6: Final answer
   x = 579,994.31