Finding the Fourth Proportional to 21,997.60, 30,349.54 and 12,436.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,997.60 : 30,349.54 = 12,436.56 : x
2. Step 2: Convert to fraction form
   21,997.60/30,349.54 = 12,436.56/x
3. Step 3: Cross multiply
   21,997.60x = 30,349.54 × 12,436.56
4. Step 4: Simplify right side
   21,997.60x = 377,443,875.18
5. Step 5: Solve for x
   x = 377,443,875.18/21,997.60
6. Step 6: Final answer
   x = 17,158.41