Finding the Fourth Proportional to 13,491.18, 18,617.79 and 7,522.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,491.18 : 18,617.79 = 7,522.47 : x
2. Step 2: Convert to fraction form
   13,491.18/18,617.79 = 7,522.47/x
3. Step 3: Cross multiply
   13,491.18x = 18,617.79 × 7,522.47
4. Step 4: Simplify right side
   13,491.18x = 140,051,766.74
5. Step 5: Solve for x
   x = 140,051,766.74/13,491.18
6. Step 6: Final answer
   x = 10,380.99