Finding the Fourth Proportional to 21,146.29, 29,168.69 and 13,602.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,146.29 : 29,168.69 = 13,602.46 : x
2. Step 2: Convert to fraction form
   21,146.29/29,168.69 = 13,602.46/x
3. Step 3: Cross multiply
   21,146.29x = 29,168.69 × 13,602.46
4. Step 4: Simplify right side
   21,146.29x = 396,765,798.04
5. Step 5: Solve for x
   x = 396,765,798.04/21,146.29
6. Step 6: Final answer
   x = 18,762.90