Finding the Fourth Proportional to 22,739.30, 31,380.79 and 12,667.91

Step by Step Solution

1. Step 1: Write the proportion equation
   22,739.30 : 31,380.79 = 12,667.91 : x
2. Step 2: Convert to fraction form
   22,739.30/31,380.79 = 12,667.91/x
3. Step 3: Cross multiply
   22,739.30x = 31,380.79 × 12,667.91
4. Step 4: Simplify right side
   22,739.30x = 397,528,874.10
5. Step 5: Solve for x
   x = 397,528,874.10/22,739.30
6. Step 6: Final answer
   x = 17,482.02