Finding the Fourth Proportional to 13,490.21, 18,616.59 and 7,522.26

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.21 : 18,616.59 = 7,522.26 : x
2. Step 2: Convert to fraction form
   13,490.21/18,616.59 = 7,522.26/x
3. Step 3: Cross multiply
   13,490.21x = 18,616.59 × 7,522.26
4. Step 4: Simplify right side
   13,490.21x = 140,038,760.48
5. Step 5: Solve for x
   x = 140,038,760.48/13,490.21
6. Step 6: Final answer
   x = 10,380.77