Finding the Fourth Proportional to 585,144.18, 877,993.83 and 405,505.89

Step by Step Solution

1. Step 1: Write the proportion equation
   585,144.18 : 877,993.83 = 405,505.89 : x
2. Step 2: Convert to fraction form
   585,144.18/877,993.83 = 405,505.89/x
3. Step 3: Cross multiply
   585,144.18x = 877,993.83 × 405,505.89
4. Step 4: Simplify right side
   585,144.18x = 356,031,669,448.66
5. Step 5: Solve for x
   x = 356,031,669,448.66/585,144.18
6. Step 6: Final answer
   x = 608,451.18