Finding the Fourth Proportional to 12,649.72, 18,969.72 and 8,742.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,649.72 : 18,969.72 = 8,742.28 : x
2. Step 2: Convert to fraction form
   12,649.72/18,969.72 = 8,742.28/x
3. Step 3: Cross multiply
   12,649.72x = 18,969.72 × 8,742.28
4. Step 4: Simplify right side
   12,649.72x = 165,838,603.76
5. Step 5: Solve for x
   x = 165,838,603.76/12,649.72
6. Step 6: Final answer
   x = 13,110.06