Finding the Fourth Proportional to 21,348.79, 29,459.59 and 12,395.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,348.79 : 29,459.59 = 12,395.59 : x
2. Step 2: Convert to fraction form
   21,348.79/29,459.59 = 12,395.59/x
3. Step 3: Cross multiply
   21,348.79x = 29,459.59 × 12,395.59
4. Step 4: Simplify right side
   21,348.79x = 365,168,999.21
5. Step 5: Solve for x
   x = 365,168,999.21/21,348.79
6. Step 6: Final answer
   x = 17,104.90