Finding the Fourth Proportional to 21,479.12, 29,641.16 and 12,047.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,479.12 : 29,641.16 = 12,047.69 : x
2. Step 2: Convert to fraction form
   21,479.12/29,641.16 = 12,047.69/x
3. Step 3: Cross multiply
   21,479.12x = 29,641.16 × 12,047.69
4. Step 4: Simplify right side
   21,479.12x = 357,107,298.48
5. Step 5: Solve for x
   x = 357,107,298.48/21,479.12
6. Step 6: Final answer
   x = 16,625.79