Finding the Fourth Proportional to 21,100.56, 29,126.10 and 12,151.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.56 : 29,126.10 = 12,151.63 : x
2. Step 2: Convert to fraction form
   21,100.56/29,126.10 = 12,151.63/x
3. Step 3: Cross multiply
   21,100.56x = 29,126.10 × 12,151.63
4. Step 4: Simplify right side
   21,100.56x = 353,929,590.54
5. Step 5: Solve for x
   x = 353,929,590.54/21,100.56
6. Step 6: Final answer
   x = 16,773.47