Finding the Fourth Proportional to 661,423.94, 913,215.82 and 443,958.78

Step by Step Solution

1. Step 1: Write the proportion equation
   661,423.94 : 913,215.82 = 443,958.78 : x
2. Step 2: Convert to fraction form
   661,423.94/913,215.82 = 443,958.78/x
3. Step 3: Cross multiply
   661,423.94x = 913,215.82 × 443,958.78
4. Step 4: Simplify right side
   661,423.94x = 405,430,181,323.90
5. Step 5: Solve for x
   x = 405,430,181,323.90/661,423.94
6. Step 6: Final answer
   x = 612,965.69