Finding the Fourth Proportional to 22,417.50, 30,936.15 and 12,991.53

Step by Step Solution

1. Step 1: Write the proportion equation
   22,417.50 : 30,936.15 = 12,991.53 : x
2. Step 2: Convert to fraction form
   22,417.50/30,936.15 = 12,991.53/x
3. Step 3: Cross multiply
   22,417.50x = 30,936.15 × 12,991.53
4. Step 4: Simplify right side
   22,417.50x = 401,907,920.81
5. Step 5: Solve for x
   x = 401,907,920.81/22,417.50
6. Step 6: Final answer
   x = 17,928.31