Finding the Fourth Proportional to 28,244.56, 42,315.20 and 13,224.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,244.56 : 42,315.20 = 13,224.12 : x
2. Step 2: Convert to fraction form
   28,244.56/42,315.20 = 13,224.12/x
3. Step 3: Cross multiply
   28,244.56x = 42,315.20 × 13,224.12
4. Step 4: Simplify right side
   28,244.56x = 559,581,216.50
5. Step 5: Solve for x
   x = 559,581,216.50/28,244.56
6. Step 6: Final answer
   x = 19,812.00