Finding the Fourth Proportional to 300,581.86, 450,941.91 and 90,223.78

Step by Step Solution

1. Step 1: Write the proportion equation
   300,581.86 : 450,941.91 = 90,223.78 : x
2. Step 2: Convert to fraction form
   300,581.86/450,941.91 = 90,223.78/x
3. Step 3: Cross multiply
   300,581.86x = 450,941.91 × 90,223.78
4. Step 4: Simplify right side
   300,581.86x = 40,685,683,680.62
5. Step 5: Solve for x
   x = 40,685,683,680.62/300,581.86
6. Step 6: Final answer
   x = 135,356.42