Finding the Fourth Proportional to 861,065.46, 1,290,898.34 and 300,493.62

Step by Step Solution

1. Step 1: Write the proportion equation
   861,065.46 : 1,290,898.34 = 300,493.62 : x
2. Step 2: Convert to fraction form
   861,065.46/1,290,898.34 = 300,493.62/x
3. Step 3: Cross multiply
   861,065.46x = 1,290,898.34 × 300,493.62
4. Step 4: Simplify right side
   861,065.46x = 387,906,715,238.59
5. Step 5: Solve for x
   x = 387,906,715,238.59/861,065.46
6. Step 6: Final answer
   x = 450,496.20