Finding the Fourth Proportional to 290,662.82, 435,989.91 and 80,296.10

Step by Step Solution

1. Step 1: Write the proportion equation
   290,662.82 : 435,989.91 = 80,296.10 : x
2. Step 2: Convert to fraction form
   290,662.82/435,989.91 = 80,296.10/x
3. Step 3: Cross multiply
   290,662.82x = 435,989.91 × 80,296.10
4. Step 4: Simplify right side
   290,662.82x = 35,008,289,412.35
5. Step 5: Solve for x
   x = 35,008,289,412.35/290,662.82
6. Step 6: Final answer
   x = 120,442.96