Finding the Fourth Proportional to 22,808.64, 31,474.72 and 12,872

Step by Step Solution

1. Step 1: Write the proportion equation
   22,808.64 : 31,474.72 = 12,872 : x
2. Step 2: Convert to fraction form
   22,808.64/31,474.72 = 12,872/x
3. Step 3: Cross multiply
   22,808.64x = 31,474.72 × 12,872
4. Step 4: Simplify right side
   22,808.64x = 405,142,595.84
5. Step 5: Solve for x
   x = 405,142,595.84/22,808.64
6. Step 6: Final answer
   x = 17,762.68