Finding the Fourth Proportional to 21,151.68, 29,189.33 and 12,654.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,151.68 : 29,189.33 = 12,654.15 : x
2. Step 2: Convert to fraction form
   21,151.68/29,189.33 = 12,654.15/x
3. Step 3: Cross multiply
   21,151.68x = 29,189.33 × 12,654.15
4. Step 4: Simplify right side
   21,151.68x = 369,366,096.95
5. Step 5: Solve for x
   x = 369,366,096.95/21,151.68
6. Step 6: Final answer
   x = 17,462.73