Finding the Fourth Proportional to 861,064.45, 1,290,896.83 and 300,492.61

Step by Step Solution

1. Step 1: Write the proportion equation
   861,064.45 : 1,290,896.83 = 300,492.61 : x
2. Step 2: Convert to fraction form
   861,064.45/1,290,896.83 = 300,492.61/x
3. Step 3: Cross multiply
   861,064.45x = 1,290,896.83 × 300,492.61
4. Step 4: Simplify right side
   861,064.45x = 387,904,957,687.43
5. Step 5: Solve for x
   x = 387,904,957,687.43/861,064.45
6. Step 6: Final answer
   x = 450,494.68