Finding the Fourth Proportional to 764,572.88, 1,055,123.34 and 420,423.72

Step by Step Solution

1. Step 1: Write the proportion equation
   764,572.88 : 1,055,123.34 = 420,423.72 : x
2. Step 2: Convert to fraction form
   764,572.88/1,055,123.34 = 420,423.72/x
3. Step 3: Cross multiply
   764,572.88x = 1,055,123.34 × 420,423.72
4. Step 4: Simplify right side
   764,572.88x = 443,598,879,661.63
5. Step 5: Solve for x
   x = 443,598,879,661.63/764,572.88
6. Step 6: Final answer
   x = 580,191.75