Finding the Fourth Proportional to 21,552.84, 29,742.64 and 12,123

Step by Step Solution

1. Step 1: Write the proportion equation
   21,552.84 : 29,742.64 = 12,123 : x
2. Step 2: Convert to fraction form
   21,552.84/29,742.64 = 12,123/x
3. Step 3: Cross multiply
   21,552.84x = 29,742.64 × 12,123
4. Step 4: Simplify right side
   21,552.84x = 360,570,024.72
5. Step 5: Solve for x
   x = 360,570,024.72/21,552.84
6. Step 6: Final answer
   x = 16,729.58