Finding the Fourth Proportional to 22,515.47, 31,075.20 and 13,089.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,515.47 : 31,075.20 = 13,089.50 : x
2. Step 2: Convert to fraction form
   22,515.47/31,075.20 = 13,089.50/x
3. Step 3: Cross multiply
   22,515.47x = 31,075.20 × 13,089.50
4. Step 4: Simplify right side
   22,515.47x = 406,758,675.02
5. Step 5: Solve for x
   x = 406,758,675.02/22,515.47
6. Step 6: Final answer
   x = 18,065.75