Finding the Fourth Proportional to 389,978.10, 585,404.55 and 301,623.30

Step by Step Solution

1. Step 1: Write the proportion equation
   389,978.10 : 585,404.55 = 301,623.30 : x
2. Step 2: Convert to fraction form
   389,978.10/585,404.55 = 301,623.30/x
3. Step 3: Cross multiply
   389,978.10x = 585,404.55 × 301,623.30
4. Step 4: Simplify right side
   389,978.10x = 176,571,652,206.02
5. Step 5: Solve for x
   x = 176,571,652,206.02/389,978.10
6. Step 6: Final answer
   x = 452,773.25