Finding the Fourth Proportional to 394,401.69, 591,662.48 and 145,064.25

Step by Step Solution

1. Step 1: Write the proportion equation
   394,401.69 : 591,662.48 = 145,064.25 : x
2. Step 2: Convert to fraction form
   394,401.69/591,662.48 = 145,064.25/x
3. Step 3: Cross multiply
   394,401.69x = 591,662.48 × 145,064.25
4. Step 4: Simplify right side
   394,401.69x = 85,829,073,189.02
5. Step 5: Solve for x
   x = 85,829,073,189.02/394,401.69
6. Step 6: Final answer
   x = 217,618.42