Finding the Fourth Proportional to 13,809.69, 19,057.28 and 7,522.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,809.69 : 19,057.28 = 7,522.07 : x
2. Step 2: Convert to fraction form
   13,809.69/19,057.28 = 7,522.07/x
3. Step 3: Cross multiply
   13,809.69x = 19,057.28 × 7,522.07
4. Step 4: Simplify right side
   13,809.69x = 143,350,061.27
5. Step 5: Solve for x
   x = 143,350,061.27/13,809.69
6. Step 6: Final answer
   x = 10,380.40