Finding the Fourth Proportional to 12,748.50, 19,121.22 and 3,389.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,748.50 : 19,121.22 = 3,389.22 : x
2. Step 2: Convert to fraction form
   12,748.50/19,121.22 = 3,389.22/x
3. Step 3: Cross multiply
   12,748.50x = 19,121.22 × 3,389.22
4. Step 4: Simplify right side
   12,748.50x = 64,806,021.25
5. Step 5: Solve for x
   x = 64,806,021.25/12,748.50
6. Step 6: Final answer
   x = 5,083.42