Finding the Fourth Proportional to 21,997.76, 30,356.96 and 12,566.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,997.76 : 30,356.96 = 12,566.28 : x
2. Step 2: Convert to fraction form
   21,997.76/30,356.96 = 12,566.28/x
3. Step 3: Cross multiply
   21,997.76x = 30,356.96 × 12,566.28
4. Step 4: Simplify right side
   21,997.76x = 381,474,059.31
5. Step 5: Solve for x
   x = 381,474,059.31/21,997.76
6. Step 6: Final answer
   x = 17,341.50