Finding the Fourth Proportional to 22,620, 31,218.48 and 12,684

Step by Step Solution

1. Step 1: Write the proportion equation
   22,620 : 31,218.48 = 12,684 : x
2. Step 2: Convert to fraction form
   22,620/31,218.48 = 12,684/x
3. Step 3: Cross multiply
   22,620x = 31,218.48 × 12,684
4. Step 4: Simplify right side
   22,620x = 395,975,200.32
5. Step 5: Solve for x
   x = 395,975,200.32/22,620
6. Step 6: Final answer
   x = 17,505.53