Finding the Fourth Proportional to 13,490.60, 18,616.32 and 7,522.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.60 : 18,616.32 = 7,522.15 : x
2. Step 2: Convert to fraction form
   13,490.60/18,616.32 = 7,522.15/x
3. Step 3: Cross multiply
   13,490.60x = 18,616.32 × 7,522.15
4. Step 4: Simplify right side
   13,490.60x = 140,034,658.41
5. Step 5: Solve for x
   x = 140,034,658.41/13,490.60
6. Step 6: Final answer
   x = 10,380.17