Finding the Fourth Proportional to 18,498.87, 25,528.10 and 12,200.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18,498.87 : 25,528.10 = 12,200.31 : x
2. Step 2: Convert to fraction form
   18,498.87/25,528.10 = 12,200.31/x
3. Step 3: Cross multiply
   18,498.87x = 25,528.10 × 12,200.31
4. Step 4: Simplify right side
   18,498.87x = 311,450,672.71
5. Step 5: Solve for x
   x = 311,450,672.71/18,498.87
6. Step 6: Final answer
   x = 16,836.20