Finding the Fourth Proportional to 13,510.67, 18,643.77 and 7,542.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,510.67 : 18,643.77 = 7,542.18 : x
2. Step 2: Convert to fraction form
   13,510.67/18,643.77 = 7,542.18/x
3. Step 3: Cross multiply
   13,510.67x = 18,643.77 × 7,542.18
4. Step 4: Simplify right side
   13,510.67x = 140,614,669.22
5. Step 5: Solve for x
   x = 140,614,669.22/13,510.67
6. Step 6: Final answer
   x = 10,407.68