Finding the Fourth Proportional to 22,391.29, 30,899.78 and 12,320.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,391.29 : 30,899.78 = 12,320.15 : x
2. Step 2: Convert to fraction form
   22,391.29/30,899.78 = 12,320.15/x
3. Step 3: Cross multiply
   22,391.29x = 30,899.78 × 12,320.15
4. Step 4: Simplify right side
   22,391.29x = 380,689,928.48
5. Step 5: Solve for x
   x = 380,689,928.48/22,391.29
6. Step 6: Final answer
   x = 17,001.70