Finding the Fourth Proportional to 685,131.90, 1,026,320.04 and 385,162.98

Step by Step Solution

1. Step 1: Write the proportion equation
   685,131.90 : 1,026,320.04 = 385,162.98 : x
2. Step 2: Convert to fraction form
   685,131.90/1,026,320.04 = 385,162.98/x
3. Step 3: Cross multiply
   685,131.90x = 1,026,320.04 × 385,162.98
4. Step 4: Simplify right side
   685,131.90x = 395,300,485,040.12
5. Step 5: Solve for x
   x = 395,300,485,040.12/685,131.90
6. Step 6: Final answer
   x = 576,969.90