Finding the Fourth Proportional to 22,515.72, 31,075.55 and 13,089.75

Step by Step Solution

1. Step 1: Write the proportion equation
   22,515.72 : 31,075.55 = 13,089.75 : x
2. Step 2: Convert to fraction form
   22,515.72/31,075.55 = 13,089.75/x
3. Step 3: Cross multiply
   22,515.72x = 31,075.55 × 13,089.75
4. Step 4: Simplify right side
   22,515.72x = 406,771,180.61
5. Step 5: Solve for x
   x = 406,771,180.61/22,515.72
6. Step 6: Final answer
   x = 18,066.10