Finding the Fourth Proportional to 13,345.50, 18,418.42 and 7,756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,345.50 : 18,418.42 = 7,756.50 : x
2. Step 2: Convert to fraction form
   13,345.50/18,418.42 = 7,756.50/x
3. Step 3: Cross multiply
   13,345.50x = 18,418.42 × 7,756.50
4. Step 4: Simplify right side
   13,345.50x = 142,862,474.73
5. Step 5: Solve for x
   x = 142,862,474.73/13,345.50
6. Step 6: Final answer
   x = 10,704.92