Finding the Fourth Proportional to 87,609, 131,418.52 and 28,449.72

Step by Step Solution

1. Step 1: Write the proportion equation
   87,609 : 131,418.52 = 28,449.72 : x
2. Step 2: Convert to fraction form
   87,609/131,418.52 = 28,449.72/x
3. Step 3: Cross multiply
   87,609x = 131,418.52 × 28,449.72
4. Step 4: Simplify right side
   87,609x = 3,738,820,096.81
5. Step 5: Solve for x
   x = 3,738,820,096.81/87,609
6. Step 6: Final answer
   x = 42,676.21