Finding the Fourth Proportional to 12,752.28, 19,120.59 and 4,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,752.28 : 19,120.59 = 4,428.72 : x
2. Step 2: Convert to fraction form
   12,752.28/19,120.59 = 4,428.72/x
3. Step 3: Cross multiply
   12,752.28x = 19,120.59 × 4,428.72
4. Step 4: Simplify right side
   12,752.28x = 84,679,739.34
5. Step 5: Solve for x
   x = 84,679,739.34/12,752.28
6. Step 6: Final answer
   x = 6,640.36