Finding the Fourth Proportional to 19,116.10, 28,674.12 and 12,540.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,116.10 : 28,674.12 = 12,540.72 : x
2. Step 2: Convert to fraction form
   19,116.10/28,674.12 = 12,540.72/x
3. Step 3: Cross multiply
   19,116.10x = 28,674.12 × 12,540.72
4. Step 4: Simplify right side
   19,116.10x = 359,594,110.17
5. Step 5: Solve for x
   x = 359,594,110.17/19,116.10
6. Step 6: Final answer
   x = 18,811.06