Finding the Fourth Proportional to 12,818.28, 19,112.55 and 12,585

Step by Step Solution

1. Step 1: Write the proportion equation
   12,818.28 : 19,112.55 = 12,585 : x
2. Step 2: Convert to fraction form
   12,818.28/19,112.55 = 12,585/x
3. Step 3: Cross multiply
   12,818.28x = 19,112.55 × 12,585
4. Step 4: Simplify right side
   12,818.28x = 240,531,441.75
5. Step 5: Solve for x
   x = 240,531,441.75/12,818.28
6. Step 6: Final answer
   x = 18,764.72