Finding the Fourth Proportional to 22,845, 31,530.42 and 12,909

Step by Step Solution

1. Step 1: Write the proportion equation
   22,845 : 31,530.42 = 12,909 : x
2. Step 2: Convert to fraction form
   22,845/31,530.42 = 12,909/x
3. Step 3: Cross multiply
   22,845x = 31,530.42 × 12,909
4. Step 4: Simplify right side
   22,845x = 407,026,191.78
5. Step 5: Solve for x
   x = 407,026,191.78/22,845
6. Step 6: Final answer
   x = 17,816.86