Finding the Fourth Proportional to 28,240.28, 42,360.72 and 8,519.00

Step by Step Solution

1. Step 1: Write the proportion equation
   28,240.28 : 42,360.72 = 8,519.00 : x
2. Step 2: Convert to fraction form
   28,240.28/42,360.72 = 8,519.00/x
3. Step 3: Cross multiply
   28,240.28x = 42,360.72 × 8,519.00
4. Step 4: Simplify right side
   28,240.28x = 360,871,111.31
5. Step 5: Solve for x
   x = 360,871,111.31/28,240.28
6. Step 6: Final answer
   x = 12,778.60