Finding the Fourth Proportional to 619,080.18, 854,016.21 and 404,345.94

Step by Step Solution

1. Step 1: Write the proportion equation
   619,080.18 : 854,016.21 = 404,345.94 : x
2. Step 2: Convert to fraction form
   619,080.18/854,016.21 = 404,345.94/x
3. Step 3: Cross multiply
   619,080.18x = 854,016.21 × 404,345.94
4. Step 4: Simplify right side
   619,080.18x = 345,317,987,207.69
5. Step 5: Solve for x
   x = 345,317,987,207.69/619,080.18
6. Step 6: Final answer
   x = 557,792.02