Finding the Fourth Proportional to 13,809.72, 19,057.62 and 7,522.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,809.72 : 19,057.62 = 7,522.20 : x
2. Step 2: Convert to fraction form
   13,809.72/19,057.62 = 7,522.20/x
3. Step 3: Cross multiply
   13,809.72x = 19,057.62 × 7,522.20
4. Step 4: Simplify right side
   13,809.72x = 143,355,229.16
5. Step 5: Solve for x
   x = 143,355,229.16/13,809.72
6. Step 6: Final answer
   x = 10,380.75