Finding the Fourth Proportional to 22,200.90, 30,636.36 and 12,642.09

Step by Step Solution

1. Step 1: Write the proportion equation
   22,200.90 : 30,636.36 = 12,642.09 : x
2. Step 2: Convert to fraction form
   22,200.90/30,636.36 = 12,642.09/x
3. Step 3: Cross multiply
   22,200.90x = 30,636.36 × 12,642.09
4. Step 4: Simplify right side
   22,200.90x = 387,307,620.39
5. Step 5: Solve for x
   x = 387,307,620.39/22,200.90
6. Step 6: Final answer
   x = 17,445.58