Finding the Fourth Proportional to 13,506.85, 18,637.88 and 7,538.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,506.85 : 18,637.88 = 7,538.31 : x
2. Step 2: Convert to fraction form
   13,506.85/18,637.88 = 7,538.31/x
3. Step 3: Cross multiply
   13,506.85x = 18,637.88 × 7,538.31
4. Step 4: Simplify right side
   13,506.85x = 140,498,117.18
5. Step 5: Solve for x
   x = 140,498,117.18/13,506.85
6. Step 6: Final answer
   x = 10,401.99