Finding the Fourth Proportional to 13,238.58, 19,860.60 and 3,878.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,238.58 : 19,860.60 = 3,878.90 : x
2. Step 2: Convert to fraction form
   13,238.58/19,860.60 = 3,878.90/x
3. Step 3: Cross multiply
   13,238.58x = 19,860.60 × 3,878.90
4. Step 4: Simplify right side
   13,238.58x = 77,037,345.54
5. Step 5: Solve for x
   x = 77,037,345.54/13,238.58
6. Step 6: Final answer
   x = 5,819.15