Finding the Fourth Proportional to 13,172.28, 19,589 and 12,757.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,172.28 : 19,589 = 12,757.02 : x
2. Step 2: Convert to fraction form
   13,172.28/19,589 = 12,757.02/x
3. Step 3: Cross multiply
   13,172.28x = 19,589 × 12,757.02
4. Step 4: Simplify right side
   13,172.28x = 249,897,264.78
5. Step 5: Solve for x
   x = 249,897,264.78/13,172.28
6. Step 6: Final answer
   x = 18,971.45