Finding the Fourth Proportional to 21,743.76, 30,011.76 and 12,317.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,743.76 : 30,011.76 = 12,317.88 : x
2. Step 2: Convert to fraction form
   21,743.76/30,011.76 = 12,317.88/x
3. Step 3: Cross multiply
   21,743.76x = 30,011.76 × 12,317.88
4. Step 4: Simplify right side
   21,743.76x = 369,681,258.27
5. Step 5: Solve for x
   x = 369,681,258.27/21,743.76
6. Step 6: Final answer
   x = 17,001.72