Finding the Fourth Proportional to 426,131.34, 639,219.04 and 404,583.12

Step by Step Solution

1. Step 1: Write the proportion equation
   426,131.34 : 639,219.04 = 404,583.12 : x
2. Step 2: Convert to fraction form
   426,131.34/639,219.04 = 404,583.12/x
3. Step 3: Cross multiply
   426,131.34x = 639,219.04 × 404,583.12
4. Step 4: Simplify right side
   426,131.34x = 258,617,233,566.61
5. Step 5: Solve for x
   x = 258,617,233,566.61/426,131.34
6. Step 6: Final answer
   x = 606,895.60