Finding the Fourth Proportional to 450,100.86, 620,644.59 and 288,895.02

Step by Step Solution

1. Step 1: Write the proportion equation
   450,100.86 : 620,644.59 = 288,895.02 : x
2. Step 2: Convert to fraction form
   450,100.86/620,644.59 = 288,895.02/x
3. Step 3: Cross multiply
   450,100.86x = 620,644.59 × 288,895.02
4. Step 4: Simplify right side
   450,100.86x = 179,301,131,240.94
5. Step 5: Solve for x
   x = 179,301,131,240.94/450,100.86
6. Step 6: Final answer
   x = 398,357.67