Finding the Fourth Proportional to 645,921.54, 891,365.31 and 359,436.69

Step by Step Solution

1. Step 1: Write the proportion equation
   645,921.54 : 891,365.31 = 359,436.69 : x
2. Step 2: Convert to fraction form
   645,921.54/891,365.31 = 359,436.69/x
3. Step 3: Cross multiply
   645,921.54x = 891,365.31 × 359,436.69
4. Step 4: Simplify right side
   645,921.54x = 320,389,396,607.22
5. Step 5: Solve for x
   x = 320,389,396,607.22/645,921.54
6. Step 6: Final answer
   x = 496,019.06