Finding the Fourth Proportional to 13,498.60, 18,636.74 and 8,469.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,498.60 : 18,636.74 = 8,469.72 : x
2. Step 2: Convert to fraction form
   13,498.60/18,636.74 = 8,469.72/x
3. Step 3: Cross multiply
   13,498.60x = 18,636.74 × 8,469.72
4. Step 4: Simplify right side
   13,498.60x = 157,847,969.51
5. Step 5: Solve for x
   x = 157,847,969.51/13,498.60
6. Step 6: Final answer
   x = 11,693.65