Finding the Fourth Proportional to 13,866.32, 19,135.55 and 7,578.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,866.32 : 19,135.55 = 7,578.70 : x
2. Step 2: Convert to fraction form
   13,866.32/19,135.55 = 7,578.70/x
3. Step 3: Cross multiply
   13,866.32x = 19,135.55 × 7,578.70
4. Step 4: Simplify right side
   13,866.32x = 145,022,563.89
5. Step 5: Solve for x
   x = 145,022,563.89/13,866.32
6. Step 6: Final answer
   x = 10,458.62