Finding the Fourth Proportional to 22,459.20, 30,991.23 and 12,387.00

Step by Step Solution

1. Step 1: Write the proportion equation
   22,459.20 : 30,991.23 = 12,387.00 : x
2. Step 2: Convert to fraction form
   22,459.20/30,991.23 = 12,387.00/x
3. Step 3: Cross multiply
   22,459.20x = 30,991.23 × 12,387.00
4. Step 4: Simplify right side
   22,459.20x = 383,888,429.90
5. Step 5: Solve for x
   x = 383,888,429.90/22,459.20
6. Step 6: Final answer
   x = 17,092.70