Finding the Fourth Proportional to 21,874.64, 30,185.12 and 12,922.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,874.64 : 30,185.12 = 12,922.56 : x
2. Step 2: Convert to fraction form
   21,874.64/30,185.12 = 12,922.56/x
3. Step 3: Cross multiply
   21,874.64x = 30,185.12 × 12,922.56
4. Step 4: Simplify right side
   21,874.64x = 390,069,024.31
5. Step 5: Solve for x
   x = 390,069,024.31/21,874.64
6. Step 6: Final answer
   x = 17,832.02