Finding the Fourth Proportional to 22,139.28, 30,684.06 and 21,724.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,139.28 : 30,684.06 = 21,724.56 : x
2. Step 2: Convert to fraction form
   22,139.28/30,684.06 = 21,724.56/x
3. Step 3: Cross multiply
   22,139.28x = 30,684.06 × 21,724.56
4. Step 4: Simplify right side
   22,139.28x = 666,597,702.51
5. Step 5: Solve for x
   x = 666,597,702.51/22,139.28
6. Step 6: Final answer
   x = 30,109.28