Finding the Fourth Proportional to 510,665.49, 765,281.25 and 403,578.63

Step by Step Solution

1. Step 1: Write the proportion equation
   510,665.49 : 765,281.25 = 403,578.63 : x
2. Step 2: Convert to fraction form
   510,665.49/765,281.25 = 403,578.63/x
3. Step 3: Cross multiply
   510,665.49x = 765,281.25 × 403,578.63
4. Step 4: Simplify right side
   510,665.49x = 308,851,158,439.69
5. Step 5: Solve for x
   x = 308,851,158,439.69/510,665.49
6. Step 6: Final answer
   x = 604,801.31