Finding the Fourth Proportional to 21,100.90, 29,122.82 and 12,153.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.90 : 29,122.82 = 12,153.58 : x
2. Step 2: Convert to fraction form
   21,100.90/29,122.82 = 12,153.58/x
3. Step 3: Cross multiply
   21,100.90x = 29,122.82 × 12,153.58
4. Step 4: Simplify right side
   21,100.90x = 353,946,522.70
5. Step 5: Solve for x
   x = 353,946,522.70/21,100.90
6. Step 6: Final answer
   x = 16,774.00