Finding the Fourth Proportional to 21,612.57, 29,827.64 and 12,667.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,612.57 : 29,827.64 = 12,667.59 : x
2. Step 2: Convert to fraction form
   21,612.57/29,827.64 = 12,667.59/x
3. Step 3: Cross multiply
   21,612.57x = 29,827.64 × 12,667.59
4. Step 4: Simplify right side
   21,612.57x = 377,844,345.86
5. Step 5: Solve for x
   x = 377,844,345.86/21,612.57
6. Step 6: Final answer
   x = 17,482.62