Finding the Fourth Proportional to 20,690.76, 28,554.72 and 12,627.48

Step by Step Solution

1. Step 1: Write the proportion equation
   20,690.76 : 28,554.72 = 12,627.48 : x
2. Step 2: Convert to fraction form
   20,690.76/28,554.72 = 12,627.48/x
3. Step 3: Cross multiply
   20,690.76x = 28,554.72 × 12,627.48
4. Step 4: Simplify right side
   20,690.76x = 360,574,155.71
5. Step 5: Solve for x
   x = 360,574,155.71/20,690.76
6. Step 6: Final answer
   x = 17,426.82