Finding the Fourth Proportional to 13,490.18, 18,615.64 and 7,522.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.18 : 18,615.64 = 7,522.24 : x
2. Step 2: Convert to fraction form
   13,490.18/18,615.64 = 7,522.24/x
3. Step 3: Cross multiply
   13,490.18x = 18,615.64 × 7,522.24
4. Step 4: Simplify right side
   13,490.18x = 140,031,311.83
5. Step 5: Solve for x
   x = 140,031,311.83/13,490.18
6. Step 6: Final answer
   x = 10,380.24