Finding the Fourth Proportional to 21,528.84, 29,709.54 and 12,099

Step by Step Solution

1. Step 1: Write the proportion equation
   21,528.84 : 29,709.54 = 12,099 : x
2. Step 2: Convert to fraction form
   21,528.84/29,709.54 = 12,099/x
3. Step 3: Cross multiply
   21,528.84x = 29,709.54 × 12,099
4. Step 4: Simplify right side
   21,528.84x = 359,455,724.46
5. Step 5: Solve for x
   x = 359,455,724.46/21,528.84
6. Step 6: Final answer
   x = 16,696.47