Finding the Fourth Proportional to 300,500.85, 450,774.72 and 87,272.25

Step by Step Solution

1. Step 1: Write the proportion equation
   300,500.85 : 450,774.72 = 87,272.25 : x
2. Step 2: Convert to fraction form
   300,500.85/450,774.72 = 87,272.25/x
3. Step 3: Cross multiply
   300,500.85x = 450,774.72 × 87,272.25
4. Step 4: Simplify right side
   300,500.85x = 39,340,124,057.52
5. Step 5: Solve for x
   x = 39,340,124,057.52/300,500.85
6. Step 6: Final answer
   x = 130,915.18