Finding the Fourth Proportional to 12,624.72, 18,936.48 and 3,390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,624.72 : 18,936.48 = 3,390.72 : x
2. Step 2: Convert to fraction form
   12,624.72/18,936.48 = 3,390.72/x
3. Step 3: Cross multiply
   12,624.72x = 18,936.48 × 3,390.72
4. Step 4: Simplify right side
   12,624.72x = 64,208,301.47
5. Step 5: Solve for x
   x = 64,208,301.47/12,624.72
6. Step 6: Final answer
   x = 5,085.92