Finding the Fourth Proportional to 21,359, 29,473.76 and 12,405.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,359 : 29,473.76 = 12,405.04 : x
2. Step 2: Convert to fraction form
   21,359/29,473.76 = 12,405.04/x
3. Step 3: Cross multiply
   21,359x = 29,473.76 × 12,405.04
4. Step 4: Simplify right side
   21,359x = 365,623,171.75
5. Step 5: Solve for x
   x = 365,623,171.75/21,359
6. Step 6: Final answer
   x = 17,117.99