Finding the Fourth Proportional to 485,667.36, 670,566.16 and 405,302.56

Step by Step Solution

1. Step 1: Write the proportion equation
   485,667.36 : 670,566.16 = 405,302.56 : x
2. Step 2: Convert to fraction form
   485,667.36/670,566.16 = 405,302.56/x
3. Step 3: Cross multiply
   485,667.36x = 670,566.16 × 405,302.56
4. Step 4: Simplify right side
   485,667.36x = 271,782,181,297.37
5. Step 5: Solve for x
   x = 271,782,181,297.37/485,667.36
6. Step 6: Final answer
   x = 559,605.61