Finding the Fourth Proportional to 300,540.16, 450,854.20 and 90,194.72

Step by Step Solution

1. Step 1: Write the proportion equation
   300,540.16 : 450,854.20 = 90,194.72 : x
2. Step 2: Convert to fraction form
   300,540.16/450,854.20 = 90,194.72/x
3. Step 3: Cross multiply
   300,540.16x = 450,854.20 × 90,194.72
4. Step 4: Simplify right side
   300,540.16x = 40,664,668,329.82
5. Step 5: Solve for x
   x = 40,664,668,329.82/300,540.16
6. Step 6: Final answer
   x = 135,305.27