Finding the Fourth Proportional to 13,499.28, 18,628.86 and 7,449.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,499.28 : 18,628.86 = 7,449.57 : x
2. Step 2: Convert to fraction form
   13,499.28/18,628.86 = 7,449.57/x
3. Step 3: Cross multiply
   13,499.28x = 18,628.86 × 7,449.57
4. Step 4: Simplify right side
   13,499.28x = 138,776,996.59
5. Step 5: Solve for x
   x = 138,776,996.59/13,499.28
6. Step 6: Final answer
   x = 10,280.33