Finding the Fourth Proportional to 12,290.10, 18,438.39 and 3,525.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,290.10 : 18,438.39 = 3,525.72 : x
2. Step 2: Convert to fraction form
   12,290.10/18,438.39 = 3,525.72/x
3. Step 3: Cross multiply
   12,290.10x = 18,438.39 × 3,525.72
4. Step 4: Simplify right side
   12,290.10x = 65,008,600.39
5. Step 5: Solve for x
   x = 65,008,600.39/12,290.10
6. Step 6: Final answer
   x = 5,289.51