Finding the Fourth Proportional to 861,061.95, 1,290,893.09 and 300,490.11

Step by Step Solution

1. Step 1: Write the proportion equation
   861,061.95 : 1,290,893.09 = 300,490.11 : x
2. Step 2: Convert to fraction form
   861,061.95/1,290,893.09 = 300,490.11/x
3. Step 3: Cross multiply
   861,061.95x = 1,290,893.09 × 300,490.11
4. Step 4: Simplify right side
   861,061.95x = 387,900,605,109.89
5. Step 5: Solve for x
   x = 387,900,605,109.89/861,061.95
6. Step 6: Final answer
   x = 450,490.94