Finding the Fourth Proportional to 13,401.36, 18,495 and 7,812.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,401.36 : 18,495 = 7,812.72 : x
2. Step 2: Convert to fraction form
   13,401.36/18,495 = 7,812.72/x
3. Step 3: Cross multiply
   13,401.36x = 18,495 × 7,812.72
4. Step 4: Simplify right side
   13,401.36x = 144,496,256.40
5. Step 5: Solve for x
   x = 144,496,256.40/13,401.36
6. Step 6: Final answer
   x = 10,782.21