Finding the Fourth Proportional to 22,391.60, 30,899.77 and 12,320.05

Step by Step Solution

1. Step 1: Write the proportion equation
   22,391.60 : 30,899.77 = 12,320.05 : x
2. Step 2: Convert to fraction form
   22,391.60/30,899.77 = 12,320.05/x
3. Step 3: Cross multiply
   22,391.60x = 30,899.77 × 12,320.05
4. Step 4: Simplify right side
   22,391.60x = 380,686,634.14
5. Step 5: Solve for x
   x = 380,686,634.14/22,391.60
6. Step 6: Final answer
   x = 17,001.31