Finding the Fourth Proportional to 13,142.98, 18,137.74 and 7,477.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.98 : 18,137.74 = 7,477.59 : x
2. Step 2: Convert to fraction form
   13,142.98/18,137.74 = 7,477.59/x
3. Step 3: Cross multiply
   13,142.98x = 18,137.74 × 7,477.59
4. Step 4: Simplify right side
   13,142.98x = 135,626,544.56
5. Step 5: Solve for x
   x = 135,626,544.56/13,142.98
6. Step 6: Final answer
   x = 10,319.31