Finding the Fourth Proportional to 22,719, 31,349.70 and 12,645.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,719 : 31,349.70 = 12,645.12 : x
2. Step 2: Convert to fraction form
   22,719/31,349.70 = 12,645.12/x
3. Step 3: Cross multiply
   22,719x = 31,349.70 × 12,645.12
4. Step 4: Simplify right side
   22,719x = 396,420,718.46
5. Step 5: Solve for x
   x = 396,420,718.46/22,719
6. Step 6: Final answer
   x = 17,448.86