Finding the Fourth Proportional to 12,578.64, 18,870.72 and 4,787.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.64 : 18,870.72 = 4,787.52 : x
2. Step 2: Convert to fraction form
   12,578.64/18,870.72 = 4,787.52/x
3. Step 3: Cross multiply
   12,578.64x = 18,870.72 × 4,787.52
4. Step 4: Simplify right side
   12,578.64x = 90,343,949.41
5. Step 5: Solve for x
   x = 90,343,949.41/12,578.64
6. Step 6: Final answer
   x = 7,182.33