Finding the Fourth Proportional to 17,145.87, 23,669.39 and 12,898.55

Step by Step Solution

1. Step 1: Write the proportion equation
   17,145.87 : 23,669.39 = 12,898.55 : x
2. Step 2: Convert to fraction form
   17,145.87/23,669.39 = 12,898.55/x
3. Step 3: Cross multiply
   17,145.87x = 23,669.39 × 12,898.55
4. Step 4: Simplify right side
   17,145.87x = 305,300,806.88
5. Step 5: Solve for x
   x = 305,300,806.88/17,145.87
6. Step 6: Final answer
   x = 17,806.08