Finding the Fourth Proportional to 17,321.94, 25,987.01 and 12,428.52

Step by Step Solution

1. Step 1: Write the proportion equation
   17,321.94 : 25,987.01 = 12,428.52 : x
2. Step 2: Convert to fraction form
   17,321.94/25,987.01 = 12,428.52/x
3. Step 3: Cross multiply
   17,321.94x = 25,987.01 × 12,428.52
4. Step 4: Simplify right side
   17,321.94x = 322,980,011.38
5. Step 5: Solve for x
   x = 322,980,011.38/17,321.94
6. Step 6: Final answer
   x = 18,645.72