Finding the Fourth Proportional to 300,991.33, 451,562.16 and 212,417.83

Step by Step Solution

1. Step 1: Write the proportion equation
   300,991.33 : 451,562.16 = 212,417.83 : x
2. Step 2: Convert to fraction form
   300,991.33/451,562.16 = 212,417.83/x
3. Step 3: Cross multiply
   300,991.33x = 451,562.16 × 212,417.83
4. Step 4: Simplify right side
   300,991.33x = 95,919,853,008.41
5. Step 5: Solve for x
   x = 95,919,853,008.41/300,991.33
6. Step 6: Final answer
   x = 318,679.79