Finding the Fourth Proportional to 13,566.57, 18,721.42 and 7,516.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,566.57 : 18,721.42 = 7,516.56 : x
2. Step 2: Convert to fraction form
   13,566.57/18,721.42 = 7,516.56/x
3. Step 3: Cross multiply
   13,566.57x = 18,721.42 × 7,516.56
4. Step 4: Simplify right side
   13,566.57x = 140,720,676.72
5. Step 5: Solve for x
   x = 140,720,676.72/13,566.57
6. Step 6: Final answer
   x = 10,372.61