Finding the Fourth Proportional to 87,819.47, 131,729.55 and 21,259.49

Step by Step Solution

1. Step 1: Write the proportion equation
   87,819.47 : 131,729.55 = 21,259.49 : x
2. Step 2: Convert to fraction form
   87,819.47/131,729.55 = 21,259.49/x
3. Step 3: Cross multiply
   87,819.47x = 131,729.55 × 21,259.49
4. Step 4: Simplify right side
   87,819.47x = 2,800,503,380.25
5. Step 5: Solve for x
   x = 2,800,503,380.25/87,819.47
6. Step 6: Final answer
   x = 31,889.32