Finding the Fourth Proportional to 290,665.82, 435,994.41 and 80,299.10

Step by Step Solution

1. Step 1: Write the proportion equation
   290,665.82 : 435,994.41 = 80,299.10 : x
2. Step 2: Convert to fraction form
   290,665.82/435,994.41 = 80,299.10/x
3. Step 3: Cross multiply
   290,665.82x = 435,994.41 × 80,299.10
4. Step 4: Simplify right side
   290,665.82x = 35,009,958,728.03
5. Step 5: Solve for x
   x = 35,009,958,728.03/290,665.82
6. Step 6: Final answer
   x = 120,447.46